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quantity.owl
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quantity.owl
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<?xml version="1.0"?>
<rdf:RDF
xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
xmlns:qudt="http://data.nasa.gov/qudt/owl/qudt#"
xmlns:cc="http://creativecommons.org/ns#"
xmlns:owl="http://www.w3.org/2002/07/owl#"
xmlns:dc="http://purl.org/dc/elements/1.1/"
xmlns:unit="http://data.nasa.gov/qudt/owl/unit#"
xmlns:quantity="http://data.nasa.gov/qudt/owl/quantity#"
xmlns:xsd="http://www.w3.org/2001/XMLSchema#"
xmlns:dim="http://data.nasa.gov/qudt/owl/dimension#"
xmlns:rdfs="http://www.w3.org/2000/01/rdf-schema#"
xml:base="http://data.qudt.org/qudt/owl/1.0.0/quantity.owl">
<owl:Ontology rdf:about="">
<dc:date rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>$Date: 2010-02-16 10:59:30 -0500 (Tue, 16 Feb 2010) $</dc:date>
<dc:title rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>The NASA QUDT Quantity Ontology</dc:title>
<dc:creator rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>James E. Masters</dc:creator>
<owl:imports rdf:resource="http://purl.org/dc/elements/1.1/"/>
<owl:imports rdf:resource="http://data.qudt.org/qudt/owl/1.0.0/dimension.owl"/>
<rdfs:label rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>QUDT Quantity</rdfs:label>
<dc:description rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>An ontology about physical quantities and the expression of their magnitude in a chosen unit of measure.</dc:description>
<owl:imports rdf:resource="http://data.qudt.org/qudt/owl/1.0.0/unit.owl"/>
<dc:subject rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Measurable Quantities</dc:subject>
<owl:imports rdf:resource="http://data.qudt.org/qudt/owl/1.0.0/qudt.owl"/>
<owl:versionInfo rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>$Id: n1quantity.n3 85 2010-02-16 15:59:30Z dmekonnen $</owl:versionInfo>
<dc:rights rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>The QUDT Ontologies are issued under a Creative Commons Attribution Share Alike 3.0 United States License. Attribution should be made to NASA AMES Research Center and TopQuadrant, Inc.</dc:rights>
</owl:Ontology>
<rdf:Description rdf:about="http://data.nasa.gov/qudt/owl/qudt#EnergyAndWorkPerMassAmountOfSubstance">
<rdfs:subClassOf>
<owl:Restriction>
<owl:hasValue>
<qudt:ChemistryQuantityKind rdf:about="http://data.nasa.gov/qudt/owl/quantity#EnergyAndWorkPerMassAmountOfSubstance">
<rdfs:label rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Energy and Work per Mass Amount of Substance</rdfs:label>
</qudt:ChemistryQuantityKind>
</owl:hasValue>
<owl:onProperty rdf:resource="http://data.nasa.gov/qudt/owl/qudt#quantityKind"/>
</owl:Restriction>
</rdfs:subClassOf>
</rdf:Description>
<qudt:RadiometryQuantityKind rdf:about="http://data.nasa.gov/qudt/owl/quantity#RadiantFlux">
<rdfs:label rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Radiant Flux</rdfs:label>
<qudt:description rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Radiant Flux, or radiant power, is the measure of the total power of electromagnetic radiation (including infrared, ultraviolet, and visible light). The power may be the total emitted from a source, or the total landing on a particular surface.</qudt:description>
<qudt:generalization>
<qudt:MechanicsQuantityKind rdf:about="http://data.nasa.gov/qudt/owl/quantity#Power">
<rdfs:label rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Power</rdfs:label>
<qudt:description rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Power is the rate at which work is performed or energy is transmitted, or the amount of energy required or expended for a given unit of time. As a rate of change of work done or the energy of a subsystem, power is:
P = W/t
where P is power
W is work
t is time. [Wikipedia]</qudt:description>
</qudt:MechanicsQuantityKind>
</qudt:generalization>
<qudt:symbol rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Φ</qudt:symbol>
</qudt:RadiometryQuantityKind>
<qudt:SystemOfQuantities rdf:about="http://data.nasa.gov/qudt/owl/quantity#SystemOfQuantities_CGS-EMU">
<qudt:systemDerivedQuantityKind>
<qudt:ElectricityAndMagnetismQuantityKind rdf:about="http://data.nasa.gov/qudt/owl/quantity#MagneticFluxPerUnitLength">
<rdfs:label rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Magnetic Flux per Unit Length</rdfs:label>
</qudt:ElectricityAndMagnetismQuantityKind>
</qudt:systemDerivedQuantityKind>
<qudt:systemBaseQuantityKind>
<qudt:QuantityKind rdf:about="http://data.nasa.gov/qudt/owl/quantity#Dimensionless">
<rdfs:label rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Dimensionless</rdfs:label>
<qudt:symbol rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>U</qudt:symbol>
</qudt:QuantityKind>
</qudt:systemBaseQuantityKind>
<qudt:systemBaseQuantityKind>
<qudt:SpaceAndTimeQuantityKind rdf:about="http://data.nasa.gov/qudt/owl/quantity#Time">
<rdfs:label rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Time</rdfs:label>
<qudt:description rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Time is a basic component of the measuring system used to sequence events, to compare the durations of events and the intervals between them, and to quantify the motions of objects.</qudt:description>
<qudt:symbol rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>T</qudt:symbol>
</qudt:SpaceAndTimeQuantityKind>
</qudt:systemBaseQuantityKind>
<qudt:systemDerivedQuantityKind>
<qudt:ElectricityAndMagnetismQuantityKind rdf:about="http://data.nasa.gov/qudt/owl/quantity#ElectromotiveForce">
<rdfs:label rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Electromotive Force</rdfs:label>
<qudt:description rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Electromotive force is the external work expended per unit of charge to produce an electric potential difference across two open-circuited terminals.</qudt:description>
<qudt:generalization>
<qudt:ElectricityAndMagnetismQuantityKind rdf:about="http://data.nasa.gov/qudt/owl/quantity#EnergyPerElectricCharge">
<rdfs:label rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Energy per Electric Charge</rdfs:label>
</qudt:ElectricityAndMagnetismQuantityKind>
</qudt:generalization>
<qudt:symbol rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>ℰ</qudt:symbol>
</qudt:ElectricityAndMagnetismQuantityKind>
</qudt:systemDerivedQuantityKind>
<rdfs:comment rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>The electromagnetic system of units is used to measure electrical quantities of electric charge, current, and voltage, within the centimeter gram second (or "CGS") metric system of units. In electromagnetic units, electric current is derived the CGS base units length, mass, and time by solving Ampere's Law (expressing the force between two parallel conducting wires) for current and setting the constant of proportionality (k_m) equal to unity. Thus, in the CGS-EMU system, electric current is derived from length, mass, and time.</rdfs:comment>
<qudt:systemDerivedQuantityKind>
<qudt:ElectricityAndMagnetismQuantityKind rdf:about="http://data.nasa.gov/qudt/owl/quantity#Capacitance">
<rdfs:label rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Capacitance</rdfs:label>
<qudt:description rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Capacitance is the ability of a body to hold an electrical charge; it is quantified as the amount of electric charge stored for a given electric potential. Capacitance is a scalar-valued quantity.</qudt:description>
</qudt:ElectricityAndMagnetismQuantityKind>
</qudt:systemDerivedQuantityKind>
<qudt:systemDerivedQuantityKind>
<qudt:ElectricityAndMagnetismQuantityKind rdf:about="http://data.nasa.gov/qudt/owl/quantity#Inductance">
<rdfs:label rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Inductance</rdfs:label>
<qudt:description rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Inductance is an electromagentic quantity that characterizes a circuit's resistance to any change of electric current; a change in the electric current through induces an opposing electromotive force (EMF). Quantitatively, inductance is proportional to the magnetic flux per unit of electric current.</qudt:description>
<qudt:symbol rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>L</qudt:symbol>
</qudt:ElectricityAndMagnetismQuantityKind>
</qudt:systemDerivedQuantityKind>
<qudt:systemDerivedQuantityKind>
<qudt:ElectricityAndMagnetismQuantityKind rdf:about="http://data.nasa.gov/qudt/owl/quantity#ElectricCurrentPerUnitLength">
<rdfs:label rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Electric Current per Unit Length</rdfs:label>
</qudt:ElectricityAndMagnetismQuantityKind>
</qudt:systemDerivedQuantityKind>
<qudt:systemBaseQuantityKind>
<qudt:SpaceAndTimeQuantityKind rdf:about="http://data.nasa.gov/qudt/owl/quantity#Length">
<rdfs:label rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Length</rdfs:label>
<qudt:symbol rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>L</qudt:symbol>
</qudt:SpaceAndTimeQuantityKind>
</qudt:systemBaseQuantityKind>
<qudt:systemDerivedQuantityKind>
<qudt:ElectricityAndMagnetismQuantityKind rdf:about="http://data.nasa.gov/qudt/owl/quantity#ElectricFlux">
<rdfs:label rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Electric Flux</rdfs:label>
<qudt:description rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>The Electric Flux through an area is defined as the electric field multiplied by the area of the surface projected in a plane perpendicular to the field. Electric Flux is a scalar-valued quantity.</qudt:description>
</qudt:ElectricityAndMagnetismQuantityKind>
</qudt:systemDerivedQuantityKind>
<qudt:systemDerivedQuantityKind>
<qudt:ElectricityAndMagnetismQuantityKind rdf:about="http://data.nasa.gov/qudt/owl/quantity#AuxillaryMagneticField">
<rdfs:label rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Auxillary Magnetic Field</rdfs:label>
<qudt:abbreviation rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>H</qudt:abbreviation>
<qudt:description rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Magnetic Fields surround magnetic materials and electric currents and are detected by the force they exert on other magnetic materials and moving electric charges. The electric and magnetic fields are two interrelated aspects of a single object, called the electromagnetic field. A pure electric field in one reference frame is observed as a combination of both an electric field and a magnetic field in a moving reference frame. The Auxillary Magnetic Field, H characterizes how the true Magnetic Field B influences the organization of magnetic dipoles in a given medium.</qudt:description>
<qudt:generalization rdf:resource="http://data.nasa.gov/qudt/owl/quantity#ElectricCurrentPerUnitLength"/>
</qudt:ElectricityAndMagnetismQuantityKind>
</qudt:systemDerivedQuantityKind>
<qudt:systemDerivedQuantityKind>
<qudt:ElectricityAndMagnetismQuantityKind rdf:about="http://data.nasa.gov/qudt/owl/quantity#MagneticField">
<rdfs:label rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Magnetic Field</rdfs:label>
<qudt:abbreviation rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>B</qudt:abbreviation>
<qudt:description rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>The Magnetic Field, denoted B, is a fundamental field in electrodynamics which characterizes the magnetic force exerted by electric currents. It is closely related to the auxillary magnetic field H (see quantity:AuxillaryMagneticField).</qudt:description>
<qudt:symbol rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>B</qudt:symbol>
</qudt:ElectricityAndMagnetismQuantityKind>
</qudt:systemDerivedQuantityKind>
<qudt:systemDerivedQuantityKind>
<qudt:ElectricityAndMagnetismQuantityKind rdf:about="http://data.nasa.gov/qudt/owl/quantity#MagneticFlux">
<rdfs:label rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Magnetic Flux</rdfs:label>
<qudt:description rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Magnetic Flux is the product of the average magnetic field times the perpendicular area that it penetrates.</qudt:description>
<qudt:symbol rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Φ</qudt:symbol>
</qudt:ElectricityAndMagnetismQuantityKind>
</qudt:systemDerivedQuantityKind>
<qudt:systemDerivedQuantityKind>
<qudt:ElectricityAndMagnetismQuantityKind rdf:about="http://data.nasa.gov/qudt/owl/quantity#ElectricField">
<rdfs:label rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Electric Field</rdfs:label>
<qudt:abbreviation rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>E</qudt:abbreviation>
<qudt:description rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>The space surrounding an electric charge or in the presence of a time-varying magnetic field has a property called an electric field. This electric field exerts a force on other electrically charged objects. In the idealized case, the force exerted between two point charges is inversely proportional to the square of the distance between them. (Coulomb's Law)</qudt:description>
</qudt:ElectricityAndMagnetismQuantityKind>
</qudt:systemDerivedQuantityKind>
<qudt:systemDerivedQuantityKind>
<qudt:ElectricityAndMagnetismQuantityKind rdf:about="http://data.nasa.gov/qudt/owl/quantity#Resistance">
<rdfs:label rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Resistance</rdfs:label>
<qudt:description rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>The electrical resistance of an object is a measure of its opposition to the passage of a steady electric current.</qudt:description>
<qudt:symbol rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>R</qudt:symbol>
</qudt:ElectricityAndMagnetismQuantityKind>
</qudt:systemDerivedQuantityKind>
<qudt:systemDerivedQuantityKind>
<qudt:ElectricityAndMagnetismQuantityKind rdf:about="http://data.nasa.gov/qudt/owl/quantity#LengthPerUnitElectricCurrent">
<rdfs:label rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Length per Unit Electric Current</rdfs:label>
</qudt:ElectricityAndMagnetismQuantityKind>
</qudt:systemDerivedQuantityKind>
<qudt:systemDerivedQuantityKind>
<qudt:ElectricityAndMagnetismQuantityKind rdf:about="http://data.nasa.gov/qudt/owl/quantity#Permittivity">
<rdfs:label rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Permittivity</rdfs:label>
<qudt:description rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Permittivity is a physical quantity that describes how an electric field affects, and is affected by a dielectric medium, and is determined by the ability of a material to polarize in response to the field, and thereby reduce the total electric field inside the material. Permittivity is often a scalar valued quantity, however in the general case it is tensor-valued.</qudt:description>
<qudt:symbol rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>ε</qudt:symbol>
</qudt:ElectricityAndMagnetismQuantityKind>
</qudt:systemDerivedQuantityKind>
<qudt:systemDerivedQuantityKind>
<qudt:ElectricityAndMagnetismQuantityKind rdf:about="http://data.nasa.gov/qudt/owl/quantity#ElectricCharge">
<rdfs:label rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Electric Charge</rdfs:label>
<qudt:description rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Electric charge is a fundamental conserved property of some subatomic particles, which determines their electromagnetic interaction. Electrically charged matter is influenced by, and produces, electromagnetic fields. The electric charge on a body may be positive or negative. Two positively charged bodies experience a mutual repulsive force, as do two negatively charged bodies. A positively charged body and a negatively charged body experience an attractive force.</qudt:description>
<qudt:symbol rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Q</qudt:symbol>
</qudt:ElectricityAndMagnetismQuantityKind>
</qudt:systemDerivedQuantityKind>
<qudt:systemDerivedQuantityKind>
<qudt:ElectricityAndMagnetismQuantityKind rdf:about="http://data.nasa.gov/qudt/owl/quantity#ElectricPotential">
<rdfs:label rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Electric Potential</rdfs:label>
<qudt:description rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>The Electric Potential is a scalar valued quantity associated with an electric field. The electric potential Φ(x) at a point, x, is formally defined as the line integral of the electric field taken along a path from x to the point at infinity. If the electric field is static, i.e. time independent, then the choice of the path is arbitrary; however if the electric field is time dependent, taking the integral along different paths will produce different results.</qudt:description>
<qudt:generalization rdf:resource="http://data.nasa.gov/qudt/owl/quantity#EnergyPerElectricCharge"/>
<qudt:symbol rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Φ</qudt:symbol>
</qudt:ElectricityAndMagnetismQuantityKind>
</qudt:systemDerivedQuantityKind>
<qudt:systemDerivedQuantityKind>
<qudt:ElectricityAndMagnetismQuantityKind rdf:about="http://data.nasa.gov/qudt/owl/quantity#ElectricCurrent">
<rdfs:label rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Electric Current</rdfs:label>
<qudt:description rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Electric Current is the flow (movement) of electric charge. The amount of electric current through some surface, e.g., a section through a copper conductor, is defined as the amount of electric charge flowing through that surface over time. Current is a scalar-valued quantity.</qudt:description>
<qudt:symbol rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>I</qudt:symbol>
</qudt:ElectricityAndMagnetismQuantityKind>
</qudt:systemDerivedQuantityKind>
<rdfs:label rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>CGS-EMU System of Quantities</rdfs:label>
<qudt:systemDerivedQuantityKind>
<qudt:ElectricityAndMagnetismQuantityKind rdf:about="http://data.nasa.gov/qudt/owl/quantity#Permeability">
<rdfs:label rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Permeability</rdfs:label>
<qudt:description rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Permeability is the degree of magnetization of a material that responds linearly to an applied magnetic field. In general permeability is a tensor-valued quantity.</qudt:description>
<qudt:symbol rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>μ</qudt:symbol>
</qudt:ElectricityAndMagnetismQuantityKind>
</qudt:systemDerivedQuantityKind>
<qudt:systemDerivedQuantityKind>
<qudt:ElectricityAndMagnetismQuantityKind rdf:about="http://data.nasa.gov/qudt/owl/quantity#MagneticDipoleMoment">
<rdfs:label rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Magnetic Dipole Moment</rdfs:label>
<qudt:description rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>The magnetic moment of a system is a measure of the magnitude and the direction of its magnetism. Magnetic moment usually refers to its Magnetic Dipole Moment, and quantifies the contribution of the system's internal magnetism to the external dipolar magnetic field produced by the system (that is, the component of the external magnetic field that is inversely proportional to the cube of the distance to the observer). The Magnetic Dipole Moment is a vector-valued quantity.</qudt:description>
<qudt:symbol rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>μ</qudt:symbol>
</qudt:ElectricityAndMagnetismQuantityKind>
</qudt:systemDerivedQuantityKind>
<qudt:systemBaseQuantityKind>
<qudt:MechanicsQuantityKind rdf:about="http://data.nasa.gov/qudt/owl/quantity#Mass">
<rdfs:label rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Mass</rdfs:label>
<qudt:symbol rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>M</qudt:symbol>
</qudt:MechanicsQuantityKind>
</qudt:systemBaseQuantityKind>
<qudt:systemDerivedQuantityKind>
<qudt:ElectricityAndMagnetismQuantityKind rdf:about="http://data.nasa.gov/qudt/owl/quantity#ElectricDisplacementField">
<rdfs:label rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Electric Displacement Field</rdfs:label>
<qudt:abbreviation rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>D</qudt:abbreviation>
<qudt:description rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>In a dielectric material the presence of an electric field E causes the bound charges in the material (atomic nuclei and their electrons) to slightly separate, inducing a local electric dipole moment. The Electric Displacement Field, D, is a vector field that accounts for the effects of free charges within such dielectric materials. </qudt:description>
<qudt:generalization>
<qudt:ElectricityAndMagnetismQuantityKind rdf:about="http://data.nasa.gov/qudt/owl/quantity#ElectricChargePerArea">
<rdfs:label rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Electric Charge per Unit Area</rdfs:label>
</qudt:ElectricityAndMagnetismQuantityKind>
</qudt:generalization>
<qudt:symbol rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>D</qudt:symbol>
</qudt:ElectricityAndMagnetismQuantityKind>
</qudt:systemDerivedQuantityKind>
<qudt:systemDerivedQuantityKind>
<qudt:ElectricityAndMagnetismQuantityKind rdf:about="http://data.nasa.gov/qudt/owl/quantity#ElectricConductivity">
<rdfs:label rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Electric Conductivity</rdfs:label>
<qudt:description rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Electric conductivity or specific conductance is a measure of a material's ability to conduct an electric current. When an electrical potential difference is placed across a conductor, its movable charges flow, giving rise to an electric current. The conductivity σ is defined as the ratio of the electric current density J to the electric field E:

J = σE

In isotropic materials, conductivity is scalar-valued, however in general, conductivity is a tensor-valued quantity.</qudt:description>
<qudt:symbol rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>σ</qudt:symbol>
</qudt:ElectricityAndMagnetismQuantityKind>
</qudt:systemDerivedQuantityKind>
<qudt:systemDerivedQuantityKind>
<qudt:ElectricityAndMagnetismQuantityKind rdf:about="http://data.nasa.gov/qudt/owl/quantity#MagnetizationField">
<rdfs:label rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Magnetization Field</rdfs:label>
<qudt:abbreviation rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>M</qudt:abbreviation>
<qudt:description rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>The Magnetization Field is defined as the ratio of magnetic moment per unit volume. It is a vector-valued quantity.</qudt:description>
<qudt:generalization rdf:resource="http://data.nasa.gov/qudt/owl/quantity#ElectricCurrentPerUnitLength"/>
<qudt:symbol rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>M</qudt:symbol>
</qudt:ElectricityAndMagnetismQuantityKind>
</qudt:systemDerivedQuantityKind>
<qudt:systemDerivedQuantityKind>
<qudt:ElectricityAndMagnetismQuantityKind rdf:about="http://data.nasa.gov/qudt/owl/quantity#MagnetomotiveForce">
<rdfs:label rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Magnetomotive Force</rdfs:label>
<qudt:description rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Magnetomotive Force (mmf) is the ability of an electric circuit to produce magnetic flux. Just as the ability of a battery to produce electric current is called its electromotive force or emf, mmf is taken as the work required to move a unit magnet pole from any point through any path which links the electric circuit back the same point in the presence of the magnetic force produced by the electric current in the circuit.</qudt:description>
</qudt:ElectricityAndMagnetismQuantityKind>
</qudt:systemDerivedQuantityKind>
<qudt:systemDerivedQuantityKind rdf:resource="http://data.nasa.gov/qudt/owl/quantity#EnergyPerElectricCharge"/>
<qudt:systemDerivedQuantityKind>
<qudt:ElectricityAndMagnetismQuantityKind rdf:about="http://data.nasa.gov/qudt/owl/quantity#ElectricCurrentDensity">
<rdfs:label rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Electric Current Density</rdfs:label>
<qudt:abbreviation rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>J</qudt:abbreviation>
<qudt:description rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Electric current density is a measure of the density of flow of electric charge; it is the electric current per unit area of cross section. Electric current density is a vector-valued quantity.</qudt:description>
<qudt:symbol rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>J</qudt:symbol>
</qudt:ElectricityAndMagnetismQuantityKind>
</qudt:systemDerivedQuantityKind>
<qudt:unitSystem rdf:resource="http://data.nasa.gov/qudt/owl/unit#SystemOfUnits_CGS-EMU"/>
<qudt:systemDerivedQuantityKind>
<qudt:ElectricityAndMagnetismQuantityKind rdf:about="http://data.nasa.gov/qudt/owl/quantity#ElectricDipoleMoment">
<rdfs:label rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Electric Dipole Moment</rdfs:label>
<qudt:description rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>The Electric Dipole Moment is a measure of the separation of positive and negative electrical charges in a system of (discrete or continuous) charges. It is a vector-valued quantity. If the system of charges is neutral, that is if the sum of all charges is zero, then the dipole moment of the system is independent of the choice of a reference frame; however in a non-neutral system, such as the dipole moment of a single proton, a dependence on the choice of reference point arises. In such cases it is conventional to choose the reference point to be the center of mass of the system or the center of charge, not some arbitrary origin. This convention ensures that the dipole moment is an intrinsic property of the system.</qudt:description>
</qudt:ElectricityAndMagnetismQuantityKind>
</qudt:systemDerivedQuantityKind>
</qudt:SystemOfQuantities>
<rdf:Description rdf:about="http://data.nasa.gov/qudt/owl/qudt#LinearEnergyTransferUnit">
<rdfs:subClassOf>
<owl:Restriction>
<owl:hasValue>
<qudt:AtomicPhysicsQuantityKind rdf:about="http://data.nasa.gov/qudt/owl/quantity#LinearEnergyTransfer">
<rdfs:label rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Linear Energy Transfer</rdfs:label>
</qudt:AtomicPhysicsQuantityKind>
</owl:hasValue>
<owl:onProperty rdf:resource="http://data.nasa.gov/qudt/owl/qudt#quantityKind"/>
</owl:Restriction>
</rdfs:subClassOf>
</rdf:Description>
<qudt:QuantityKind rdf:about="http://data.nasa.gov/qudt/owl/quantity#AbsoluteHumidity">
<rdfs:label rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Absolute Humidity</rdfs:label>
<qudt:description rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Absolute humidity is the mass of water in a particular volume of air. It is a measure of the density of water vapor in an atmosphere.</qudt:description>
<qudt:generalization>
<qudt:MechanicsQuantityKind rdf:about="http://data.nasa.gov/qudt/owl/quantity#Density">
<rdfs:label rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Density</rdfs:label>
</qudt:MechanicsQuantityKind>
</qudt:generalization>
</qudt:QuantityKind>
<rdf:Description rdf:about="http://data.nasa.gov/qudt/owl/qudt#CurrentPerAngleUnit">
<rdfs:subClassOf>
<owl:Restriction>
<owl:hasValue>
<qudt:ElectricityAndMagnetismQuantityKind rdf:about="http://data.nasa.gov/qudt/owl/quantity#ElectricCurrentPerAngle">
<rdfs:label rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Electric Current per Angle</rdfs:label>
</qudt:ElectricityAndMagnetismQuantityKind>
</owl:hasValue>
<owl:onProperty rdf:resource="http://data.nasa.gov/qudt/owl/qudt#quantityKind"/>
</owl:Restriction>
</rdfs:subClassOf>
</rdf:Description>
<rdf:Description rdf:about="http://data.nasa.gov/qudt/owl/qudt#CurvatureUnit">
<rdfs:subClassOf>
<owl:Restriction>
<owl:hasValue>
<qudt:SpaceAndTimeQuantityKind rdf:about="http://data.nasa.gov/qudt/owl/quantity#Curvature">
<rdfs:label rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Curvature</rdfs:label>
<qudt:description rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>The canonical example of extrinsic curvature is that of a circle, which has curvature equal to the inverse of its radius everywhere. Smaller circles bend more sharply, and hence have higher curvature. The curvature of a smooth curve is defined as the curvature of its osculating circle at each point. The osculating circle of a sufficiently smooth plane curve at a given point on the curve is the circle whose center lies on the inner normal line and whose curvature is the same as that of the given curve at that point. This circle is tangent to the curve at the given point.
That is, given a point P on a smooth curve C, the curvature of C at P is defined to be 1/R where R is the radius of the osculating circle of C at P. The magnitude of curvature at points on physical curves can be measured in diopters (also spelled dioptre) — this is the convention in optics. [Wikipedia]</qudt:description>
</qudt:SpaceAndTimeQuantityKind>
</owl:hasValue>
<owl:onProperty rdf:resource="http://data.nasa.gov/qudt/owl/qudt#quantityKind"/>
</owl:Restriction>
</rdfs:subClassOf>
</rdf:Description>
<qudt:QuantumMechanicsQuantityKind rdf:about="http://data.nasa.gov/qudt/owl/quantity#Action">
<rdfs:label>Action</rdfs:label>
<qudt:abbreviation rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>S</qudt:abbreviation>
<qudt:symbol rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>S</qudt:symbol>
</qudt:QuantumMechanicsQuantityKind>
<qudt:RadiometryQuantityKind rdf:about="http://data.nasa.gov/qudt/owl/quantity#Radiance">
<rdfs:label rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Radiance</rdfs:label>
<qudt:description rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Radiance is a radiometric measure that describes the amount of light that passes through or is emitted from a particular area, and falls within a given solid angle in a specified direction.</qudt:description>
<qudt:generalization>
<qudt:MechanicsQuantityKind rdf:about="http://data.nasa.gov/qudt/owl/quantity#PowerPerAreaAngle">
<rdfs:label rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Power per Area Angle</rdfs:label>
</qudt:MechanicsQuantityKind>
</qudt:generalization>
</qudt:RadiometryQuantityKind>
<rdf:Description rdf:about="http://data.nasa.gov/qudt/owl/qudt#ElectricCurrentDensityUnit">
<rdfs:subClassOf>
<owl:Restriction>
<owl:hasValue rdf:resource="http://data.nasa.gov/qudt/owl/quantity#ElectricCurrentDensity"/>
<owl:onProperty rdf:resource="http://data.nasa.gov/qudt/owl/qudt#quantityKind"/>
</owl:Restriction>
</rdfs:subClassOf>
</rdf:Description>
<rdf:Description rdf:about="http://data.nasa.gov/qudt/owl/qudt#MagneticFluxUnit">
<rdfs:subClassOf>
<owl:Restriction>
<owl:hasValue rdf:resource="http://data.nasa.gov/qudt/owl/quantity#MagneticFlux"/>
<owl:onProperty rdf:resource="http://data.nasa.gov/qudt/owl/qudt#quantityKind"/>
</owl:Restriction>
</rdfs:subClassOf>
</rdf:Description>
<rdf:Description rdf:about="http://data.nasa.gov/qudt/owl/qudt#PowerPerAreaUnit">
<rdfs:subClassOf>
<owl:Restriction>
<owl:hasValue>
<qudt:MechanicsQuantityKind rdf:about="http://data.nasa.gov/qudt/owl/quantity#PowerPerArea">
<rdfs:label rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Power per Area</rdfs:label>
</qudt:MechanicsQuantityKind>
</owl:hasValue>
<owl:onProperty rdf:resource="http://data.nasa.gov/qudt/owl/qudt#quantityKind"/>
</owl:Restriction>
</rdfs:subClassOf>
</rdf:Description>
<qudt:FluidMechanicsQuantityKind rdf:about="http://data.nasa.gov/qudt/owl/quantity#TotalPressure">
<rdfs:label rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Total Pressure</rdfs:label>
<qudt:description rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
> The total pressure is the sum of the dynamic and static pressures, i.e. P_0 = P + q.</qudt:description>
<qudt:generalization>
<qudt:FluidMechanicsQuantityKind rdf:about="http://data.nasa.gov/qudt/owl/quantity#Pressure">
<rdfs:label rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Pressure</rdfs:label>
<qudt:description rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Pressure is an effect which occurs when a force is applied on a surface. Pressure is the amount of force acting on a unit area. Pressure is distinct from stress, as the former is the ratio of the component of force normal to a surface to the surface area. Stress is a tensor that relates the vector force to the vector area.</qudt:description>
<qudt:generalization>
<qudt:MechanicsQuantityKind rdf:about="http://data.nasa.gov/qudt/owl/quantity#ForcePerArea">
<rdfs:label rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Force Per Area</rdfs:label>
</qudt:MechanicsQuantityKind>
</qudt:generalization>
</qudt:FluidMechanicsQuantityKind>
</qudt:generalization>
<qudt:symbol rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>P_0</qudt:symbol>
</qudt:FluidMechanicsQuantityKind>
<rdf:Description rdf:about="http://data.nasa.gov/qudt/owl/qudt#AreaUnit">
<rdfs:subClassOf>
<owl:Restriction>
<owl:hasValue>
<qudt:SpaceAndTimeQuantityKind rdf:about="http://data.nasa.gov/qudt/owl/quantity#Area">
<rdfs:label rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Area</rdfs:label>
<qudt:description rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Area is a quantity expressing the two-dimensional size of a defined part of a surface, typically a region bounded by a closed curve.</qudt:description>
</qudt:SpaceAndTimeQuantityKind>
</owl:hasValue>
<owl:onProperty rdf:resource="http://data.nasa.gov/qudt/owl/qudt#quantityKind"/>
</owl:Restriction>
</rdfs:subClassOf>
</rdf:Description>
<rdf:Description rdf:about="http://data.nasa.gov/qudt/owl/qudt#VelocityUnit">
<rdfs:subClassOf>
<owl:Restriction>
<owl:hasValue>
<qudt:SpaceAndTimeQuantityKind rdf:about="http://data.nasa.gov/qudt/owl/quantity#Velocity">
<rdfs:label rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Velocity</rdfs:label>
</qudt:SpaceAndTimeQuantityKind>
</owl:hasValue>
<owl:onProperty rdf:resource="http://data.nasa.gov/qudt/owl/qudt#quantityKind"/>
</owl:Restriction>
</rdfs:subClassOf>
</rdf:Description>
<rdf:Description rdf:about="http://data.nasa.gov/qudt/owl/qudt#TimeAreaUnit">
<rdfs:subClassOf>
<owl:Restriction>
<owl:hasValue>
<qudt:SpaceAndTimeQuantityKind rdf:about="http://data.nasa.gov/qudt/owl/quantity#AreaTime">
<rdfs:label rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Area Time</rdfs:label>
</qudt:SpaceAndTimeQuantityKind>
</owl:hasValue>
<owl:onProperty rdf:resource="http://data.nasa.gov/qudt/owl/qudt#quantityKind"/>
</owl:Restriction>
</rdfs:subClassOf>
</rdf:Description>
<rdf:Description rdf:about="http://data.nasa.gov/qudt/owl/qudt#AngularVelocityUnit">
<rdfs:subClassOf>
<owl:Restriction>
<owl:hasValue>
<qudt:SpaceAndTimeQuantityKind rdf:about="http://data.nasa.gov/qudt/owl/quantity#AngularVelocity">
<rdfs:label rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Angular Velocity</rdfs:label>
<qudt:description rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>The change of angle per unit time; specifically, in celestial mechanics, the change in angle of the radius vector per unit time.</qudt:description>
<qudt:generalization rdf:resource="http://data.nasa.gov/qudt/owl/quantity#Velocity"/>
</qudt:SpaceAndTimeQuantityKind>
</owl:hasValue>
<owl:onProperty rdf:resource="http://data.nasa.gov/qudt/owl/qudt#quantityKind"/>
</owl:Restriction>
</rdfs:subClassOf>
</rdf:Description>
<rdf:Description rdf:about="http://data.nasa.gov/qudt/owl/qudt#ElectricFieldStrengthUnit">
<rdfs:subClassOf>
<owl:Restriction>
<owl:hasValue rdf:resource="http://data.nasa.gov/qudt/owl/quantity#ElectricField"/>
<owl:onProperty rdf:resource="http://data.nasa.gov/qudt/owl/qudt#quantityKind"/>
</owl:Restriction>
</rdfs:subClassOf>
</rdf:Description>
<qudt:ThermodynamicsQuantityKind rdf:about="http://data.nasa.gov/qudt/owl/quantity#CompressibilityFactor">
<rdfs:label rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Compressibility Factor</rdfs:label>
<qudt:description rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>The compressibility factor (Z) is a useful thermodynamic property for modifying the ideal gas law to account for the real gas behaviour. The closer a gas is to a phase change, the larger the deviations from ideal behavior. Values for compressibility are calculated using equations of state (EOS), such as the virial equation and van der Waals equation. The compressibility factor for specific gases can be obtained, with out calculation, from compressibility charts. These charts are created by plotting Z as a function of pressure at constant temperature.</qudt:description>
<qudt:generalization>
<qudt:QuantityKind rdf:about="http://data.nasa.gov/qudt/owl/quantity#DimensionlessRatio">
<rdfs:label rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Dimensionless Ratio</rdfs:label>
<qudt:generalization rdf:resource="http://data.nasa.gov/qudt/owl/quantity#Dimensionless"/>
<qudt:symbol rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>ψ</qudt:symbol>
</qudt:QuantityKind>
</qudt:generalization>
<qudt:symbol rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Z</qudt:symbol>
</qudt:ThermodynamicsQuantityKind>
<qudt:SystemOfQuantities rdf:about="http://data.nasa.gov/qudt/owl/quantity#SystemOfQuantities_SI">
<qudt:unitSystem rdf:resource="http://data.nasa.gov/qudt/owl/unit#SystemOfUnits_SI"/>
<qudt:systemDerivedQuantityKind rdf:resource="http://data.nasa.gov/qudt/owl/quantity#Permeability"/>
<qudt:systemDerivedQuantityKind>
<qudt:ThermodynamicsQuantityKind rdf:about="http://data.nasa.gov/qudt/owl/quantity#InverseTimeTemperature">
<rdfs:label rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Inverse Time Temperature</rdfs:label>
</qudt:ThermodynamicsQuantityKind>
</qudt:systemDerivedQuantityKind>
<qudt:systemDerivedQuantityKind>
<qudt:ThermodynamicsQuantityKind rdf:about="http://data.nasa.gov/qudt/owl/quantity#MassTemperature">
<rdfs:label rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Mass Temperature</rdfs:label>
</qudt:ThermodynamicsQuantityKind>
</qudt:systemDerivedQuantityKind>
<qudt:systemDerivedQuantityKind>
<qudt:RadiologyQuantityKind rdf:about="http://data.nasa.gov/qudt/owl/quantity#AbsorbedDoseRate">
<rdfs:label rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Absorbed Dose Rate</rdfs:label>
</qudt:RadiologyQuantityKind>
</qudt:systemDerivedQuantityKind>
<qudt:systemDerivedQuantityKind>
<qudt:MechanicsQuantityKind rdf:about="http://data.nasa.gov/qudt/owl/quantity#SpecificImpulseByMass">
<rdfs:label rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Specific Impulse by Mass</rdfs:label>
<qudt:generalization>
<qudt:SpaceAndTimeQuantityKind rdf:about="http://data.nasa.gov/qudt/owl/quantity#LinearVelocity">
<rdfs:label rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Linear Velocity</rdfs:label>
<qudt:generalization rdf:resource="http://data.nasa.gov/qudt/owl/quantity#Velocity"/>
</qudt:SpaceAndTimeQuantityKind>
</qudt:generalization>
</qudt:MechanicsQuantityKind>
</qudt:systemDerivedQuantityKind>
<qudt:systemDerivedQuantityKind>
<qudt:ThermodynamicsQuantityKind rdf:about="http://data.nasa.gov/qudt/owl/quantity#ThermalResistivity">
<rdfs:label rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Thermal Resistivity</rdfs:label>
<qudt:description rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>The reciprocal of thermal conductivity is thermal resistivity, measured in kelvin-metres per watt (K*m/W).</qudt:description>
</qudt:ThermodynamicsQuantityKind>
</qudt:systemDerivedQuantityKind>
<qudt:systemDerivedQuantityKind>
<qudt:ThermodynamicsQuantityKind rdf:about="http://data.nasa.gov/qudt/owl/quantity#LinearThermalExpansion">
<rdfs:label rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Linear Thermal Expansion</rdfs:label>
<qudt:description rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>When the temperature of a substance changes, the energy that is stored in the intermolecular bonds between atoms changes. When the stored energy increases, so does the length of the molecular bonds. As a result, solids typically expand in response to heating and contract on cooling; this dimensional response to temperature change is expressed by its coefficient of thermal expansion.
Different coefficients of thermal expansion can be defined for a substance depending on whether the expansion is measured by:
* linear thermal expansion
* area thermal expansion
* volumetric thermal expansion
These characteristics are closely related. The volumetric thermal expansion coefficient can be defined for both liquids and solids. The linear thermal expansion can only be defined for solids, and is common in engineering applications.
Some substances expand when cooled, such as freezing water, so they have negative thermal expansion coefficients. [Wikipedia]</qudt:description>
</qudt:ThermodynamicsQuantityKind>
</qudt:systemDerivedQuantityKind>
<qudt:systemDerivedQuantityKind>
<qudt:ElectricityAndMagnetismQuantityKind rdf:about="http://data.nasa.gov/qudt/owl/quantity#InversePermittivity">
<rdfs:label rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Inverse Permittivity</rdfs:label>
</qudt:ElectricityAndMagnetismQuantityKind>
</qudt:systemDerivedQuantityKind>
<qudt:systemDerivedQuantityKind>
<qudt:MechanicsQuantityKind rdf:about="http://data.nasa.gov/qudt/owl/quantity#ForcePerAreaTime">
<rdfs:label rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Force Per Area Time</rdfs:label>
</qudt:MechanicsQuantityKind>
</qudt:systemDerivedQuantityKind>
<qudt:systemDerivedQuantityKind>
<qudt:ElectricityAndMagnetismQuantityKind rdf:about="http://data.nasa.gov/qudt/owl/quantity#PolarizationField">
<rdfs:label rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Polarization Field</rdfs:label>
<qudt:description rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>The Polarization Field is the vector field that expresses the density of permanent or induced electric dipole moments in a dielectric material. The polarization vector P is defined as the ratio of electric dipole moment per unit volume.</qudt:description>
<qudt:generalization rdf:resource="http://data.nasa.gov/qudt/owl/quantity#ElectricChargePerArea"/>
<qudt:symbol rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>P</qudt:symbol>
</qudt:ElectricityAndMagnetismQuantityKind>
</qudt:systemDerivedQuantityKind>
<qudt:systemDerivedQuantityKind rdf:resource="http://data.nasa.gov/qudt/owl/quantity#ForcePerArea"/>
<qudt:systemDerivedQuantityKind>
<qudt:ThermodynamicsQuantityKind rdf:about="http://data.nasa.gov/qudt/owl/quantity#HeatFlowRatePerUnitArea">
<rdfs:label rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Heat Flow Rate per Unit Area</rdfs:label>
<qudt:generalization rdf:resource="http://data.nasa.gov/qudt/owl/quantity#PowerPerArea"/>
</qudt:ThermodynamicsQuantityKind>
</qudt:systemDerivedQuantityKind>
<qudt:systemDerivedQuantityKind>
<qudt:MechanicsQuantityKind rdf:about="http://data.nasa.gov/qudt/owl/quantity#MomentOfInertia">
<rdfs:label rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Moment of Inertia</rdfs:label>
</qudt:MechanicsQuantityKind>
</qudt:systemDerivedQuantityKind>
<qudt:systemDerivedQuantityKind>
<qudt:ThermodynamicsQuantityKind rdf:about="http://data.nasa.gov/qudt/owl/quantity#CoefficientOfHeatTransfer">
<rdfs:label rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Coefficient of Heat Transfer</rdfs:label>
</qudt:ThermodynamicsQuantityKind>
</qudt:systemDerivedQuantityKind>
<qudt:systemDerivedQuantityKind>
<qudt:MechanicsQuantityKind rdf:about="http://data.nasa.gov/qudt/owl/quantity#LinearMomentum">
<rdfs:label rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Linear Momentum</rdfs:label>
<qudt:description rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Linear momentum is the product of mass and linear velocity. The SI unit for linear momentum is meter-kilogram per second (m-kg/s).</qudt:description>
<qudt:generalization>
<qudt:MechanicsQuantityKind rdf:about="http://data.nasa.gov/qudt/owl/quantity#Momentum">
<rdfs:label rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Momentum</rdfs:label>
<qudt:description rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Quantity of motion. Linear momentum is the quantity obtained by multiplying the mass of a body by its linear speed. Angular momentum is the quantity obtained by multiplying the moment of inertia of a body by its angular speed.
The momentum of a system of particles is given by the sum of the momentums of the individual particles which make up the system or by the product of the total mass of the system and the velocity of the center of gravity of the system.
The momentum of a continuous medium is given by the integral of the velocity over the mass of the medium or by the product of the total mass of the medium and the velocity of the center of gravity of the medium.</qudt:description>
</qudt:MechanicsQuantityKind>
</qudt:generalization>
</qudt:MechanicsQuantityKind>
</qudt:systemDerivedQuantityKind>
<qudt:systemDerivedQuantityKind>
<qudt:ThermodynamicsQuantityKind rdf:about="http://data.nasa.gov/qudt/owl/quantity#TimeTemperature">
<rdfs:label rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Time Temperature</rdfs:label>
</qudt:ThermodynamicsQuantityKind>
</qudt:systemDerivedQuantityKind>
<qudt:systemDerivedQuantityKind rdf:resource="http://data.nasa.gov/qudt/owl/quantity#ElectricField"/>
<qudt:systemBaseQuantityKind rdf:resource="http://data.nasa.gov/qudt/owl/quantity#Time"/>
<qudt:systemDerivedQuantityKind rdf:resource="http://data.nasa.gov/qudt/owl/quantity#MagnetizationField"/>
<qudt:systemDerivedQuantityKind>
<qudt:SolidMechanicsQuantityKind rdf:about="http://data.nasa.gov/qudt/owl/quantity#Stress">
<rdfs:label rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Stress</rdfs:label>
<qudt:description rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Stress is a measure of the average amount of force exerted per unit area of a surface within a deformable body on which internal forces act. In other words, it is a measure of the intensity or internal distribution of the total internal forces acting within a deformable body across imaginary surfaces. These internal forces are produced between the particles in the body as a reaction to external forces applied on the body.</qudt:description>
<qudt:generalization rdf:resource="http://data.nasa.gov/qudt/owl/quantity#ForcePerArea"/>
</qudt:SolidMechanicsQuantityKind>
</qudt:systemDerivedQuantityKind>
<qudt:systemDerivedQuantityKind>
<qudt:ThermodynamicsQuantityKind rdf:about="http://data.nasa.gov/qudt/owl/quantity#PowerPerAreaQuarticTemperature">
<rdfs:label rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Power per Area Quartic Temperature</rdfs:label>
</qudt:ThermodynamicsQuantityKind>
</qudt:systemDerivedQuantityKind>
<qudt:systemDerivedQuantityKind>
<qudt:SpaceAndTimeQuantityKind rdf:about="http://data.nasa.gov/qudt/owl/quantity#TimeSquared">
<rdfs:label rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Time Squared</rdfs:label>
</qudt:SpaceAndTimeQuantityKind>
</qudt:systemDerivedQuantityKind>
<qudt:systemDerivedQuantityKind>
<qudt:MechanicsQuantityKind rdf:about="http://data.nasa.gov/qudt/owl/quantity#MolarAngularMomentum">
<rdfs:label rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Molar Angular Momentum</rdfs:label>
</qudt:MechanicsQuantityKind>
</qudt:systemDerivedQuantityKind>
<qudt:systemDerivedQuantityKind>
<qudt:MechanicsQuantityKind rdf:about="http://data.nasa.gov/qudt/owl/quantity#Torque">
<rdfs:label rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Torque</rdfs:label>
<qudt:description rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>In physics, a torque (τ) is a vector that measures the tendency of a force to rotate an object about some axis [1]. The magnitude of a torque is defined as force times its lever arm [2]. Just as a force is a push or a pull, a torque can be thought of as a twist.
The SI unit for torque is newton meters (N m). In U.S. customary units, it is measured in foot pounds (ft lbf) (also known as 'pounds feet').
Mathematically, the torque on a particle (which has the position r in some reference frame) can be defined as the cross product:
τ = r x F
where
r is the particle's position vector relative to the fulcrum
F is the force acting on the particles,
or, more generally, torque can be defined as the rate of change of angular momentum,
τ = dL/dt
where
L is the angular momentum vector
t stands for time. [Wikipedia]</qudt:description>
</qudt:MechanicsQuantityKind>
</qudt:systemDerivedQuantityKind>
<qudt:systemDerivedQuantityKind>
<qudt:ElectricityAndMagnetismQuantityKind rdf:about="http://data.nasa.gov/qudt/owl/quantity#ElectricQuadrupoleMoment">
<rdfs:label rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Electric Quadrupole Moment</rdfs:label>
<qudt:description rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>The Electric Quadrupole Moment is a quantity which describes the effective shape of the ellipsoid of nuclear charge distribution. A non-zero quadrupole moment Q indicates that the charge distribution is not spherically symmetric. By convention, the value of Q is taken to be positive if the ellipsoid is prolate and negative if it is oblate. In general, the electric quadrupole moment is tensor-valued.</qudt:description>
<qudt:symbol rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Q</qudt:symbol>
</qudt:ElectricityAndMagnetismQuantityKind>
</qudt:systemDerivedQuantityKind>
<qudt:systemDerivedQuantityKind rdf:resource="http://data.nasa.gov/qudt/owl/quantity#MagneticFluxPerUnitLength"/>
<qudt:systemDerivedQuantityKind>
<qudt:MechanicsQuantityKind rdf:about="http://data.nasa.gov/qudt/owl/quantity#ThrustToMassRatio">
<rdfs:label rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Thrust to Mass Ratio</rdfs:label>
</qudt:MechanicsQuantityKind>
</qudt:systemDerivedQuantityKind>
<qudt:systemDerivedQuantityKind>
<qudt:ChemistryQuantityKind rdf:about="http://data.nasa.gov/qudt/owl/quantity#AmountOfSubstancePerUnitVolume">
<rdfs:label rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Amount of Substance Per Unit Volume</rdfs:label>
<qudt:generalization>
<qudt:ChemistryQuantityKind rdf:about="http://data.nasa.gov/qudt/owl/quantity#Concentration">
<rdfs:label rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Concentration</rdfs:label>
</qudt:ChemistryQuantityKind>
</qudt:generalization>
</qudt:ChemistryQuantityKind>
</qudt:systemDerivedQuantityKind>
<qudt:systemDerivedQuantityKind>
<qudt:ElectricityAndMagnetismQuantityKind rdf:about="http://data.nasa.gov/qudt/owl/quantity#ElectricCurrentPerUnitEnergy">
<rdfs:label rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Electric Current per Unit Energy</rdfs:label>
</qudt:ElectricityAndMagnetismQuantityKind>
</qudt:systemDerivedQuantityKind>
<qudt:systemDerivedQuantityKind>
<qudt:QuantumMechanicsQuantityKind rdf:about="http://data.nasa.gov/qudt/owl/quantity#Activity">
<rdfs:label rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Activity</rdfs:label>
<qudt:description rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Activity is the term used to characterise the number of nuclei which disintegrate in a radioactive substance per unit time. Activity is usually measured in Becquerels (Bq), where 1 Bq is 1 disintegration per second.</qudt:description>
<qudt:generalization>
<qudt:SpaceAndTimeQuantityKind rdf:about="http://data.nasa.gov/qudt/owl/quantity#StochasticProcess">
<rdfs:label rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Stochastic Process</rdfs:label>
<qudt:generalization>
<qudt:SpaceAndTimeQuantityKind rdf:about="http://data.nasa.gov/qudt/owl/quantity#Frequency">
<rdfs:label rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Frequency</rdfs:label>
<qudt:description rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Frequency is the number of occurrences of a repeatiing event per unit time. The repetition of the events may be periodic (i.e. the length of time between event repetitions is fixed) or aperiodic (i.e. the length of time between event repetitions varies). Therefore, we distinguish between periodic and aperiodic frequencies. In the SI system, periodic frequency is measured in hertz (Hz) or multiples of hertz, while aperiodic frequency is measured in becquerel (Bq).</qudt:description>
</qudt:SpaceAndTimeQuantityKind>
</qudt:generalization>
</qudt:SpaceAndTimeQuantityKind>
</qudt:generalization>
</qudt:QuantumMechanicsQuantityKind>
</qudt:systemDerivedQuantityKind>
<qudt:systemDerivedQuantityKind>
<qudt:RadiologyQuantityKind rdf:about="http://data.nasa.gov/qudt/owl/quantity#DoseEquivalent">
<rdfs:label rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Dose Equivalent</rdfs:label>
<qudt:description rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>The equivalent dose to a tissue is found by multiplying the absorbed dose, in gray, by a dimensionless "quality factor" Q, dependent upon radiation type, and by another dimensionless factor N, dependent on all other pertinent factors. N depends upon the part of the body irradiated, the time and volume over which the dose was spread, even the species of the subject.</qudt:description>
<qudt:generalization>
<qudt:MechanicsQuantityKind rdf:about="http://data.nasa.gov/qudt/owl/quantity#SpecificEnergy">
<rdfs:label rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Specific Energy</rdfs:label>
</qudt:MechanicsQuantityKind>
</qudt:generalization>
</qudt:RadiologyQuantityKind>
</qudt:systemDerivedQuantityKind>
<qudt:systemDerivedQuantityKind rdf:resource="http://data.nasa.gov/qudt/owl/quantity#ElectricFlux"/>
<qudt:systemDerivedQuantityKind>
<qudt:ThermodynamicsQuantityKind rdf:about="http://data.nasa.gov/qudt/owl/quantity#VolumetricHeatCapacity">
<rdfs:label rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Volumetric Heat Capacity</rdfs:label>
</qudt:ThermodynamicsQuantityKind>
</qudt:systemDerivedQuantityKind>
<qudt:systemDerivedQuantityKind>
<qudt:PhotometryQuantityKind rdf:about="http://data.nasa.gov/qudt/owl/quantity#LuminousEnergy">
<rdfs:label rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Luminous Energy</rdfs:label>
<qudt:description rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Luminous Energy is the perceived energy of light. This is sometimes also called the quantity of light.</qudt:description>
<qudt:symbol rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Qv</qudt:symbol>
</qudt:PhotometryQuantityKind>
</qudt:systemDerivedQuantityKind>
<qudt:systemDerivedQuantityKind>
<qudt:ChemistryQuantityKind rdf:about="http://data.nasa.gov/qudt/owl/quantity#TemperatureAmountOfSubstance">
<rdfs:label rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Temperature Amount of Substance</rdfs:label>
</qudt:ChemistryQuantityKind>
</qudt:systemDerivedQuantityKind>
<qudt:systemDerivedQuantityKind rdf:resource="http://data.nasa.gov/qudt/owl/quantity#EnergyPerElectricCharge"/>
<qudt:systemDerivedQuantityKind rdf:resource="http://data.nasa.gov/qudt/owl/quantity#PowerPerAreaAngle"/>
<qudt:systemDerivedQuantityKind rdf:resource="http://data.nasa.gov/qudt/owl/quantity#MagnetomotiveForce"/>
<qudt:systemDerivedQuantityKind rdf:resource="http://data.nasa.gov/qudt/owl/quantity#ElectricCurrentPerUnitLength"/>
<rdfs:label rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>International System of Quantities</rdfs:label>
<qudt:systemDerivedQuantityKind>
<qudt:MechanicsQuantityKind rdf:about="http://data.nasa.gov/qudt/owl/quantity#PowerAreaPerSolidAngle">
<rdfs:label rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Power Area per Solid Angle</rdfs:label>
</qudt:MechanicsQuantityKind>
</qudt:systemDerivedQuantityKind>
<qudt:systemDerivedQuantityKind rdf:resource="http://data.nasa.gov/qudt/owl/quantity#Frequency"/>
<qudt:systemDerivedQuantityKind>
<qudt:SpaceAndTimeQuantityKind rdf:about="http://data.nasa.gov/qudt/owl/quantity#InverseLength">
<rdfs:label rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Inverse Length</rdfs:label>
</qudt:SpaceAndTimeQuantityKind>
</qudt:systemDerivedQuantityKind>
<qudt:systemDerivedQuantityKind rdf:resource="http://data.nasa.gov/qudt/owl/quantity#ElectromotiveForce"/>
<qudt:systemDerivedQuantityKind>
<qudt:MechanicsQuantityKind rdf:about="http://data.nasa.gov/qudt/owl/quantity#MassPerTime">
<rdfs:label rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Mass per Time</rdfs:label>
</qudt:MechanicsQuantityKind>
</qudt:systemDerivedQuantityKind>
<qudt:systemDerivedQuantityKind>
<qudt:ThermodynamicsQuantityKind rdf:about="http://data.nasa.gov/qudt/owl/quantity#VolumeThermalExpansion">
<rdfs:label rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Volume Thermal Expansion</rdfs:label>
<qudt:description rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>When the temperature of a substance changes, the energy that is stored in the intermolecular bonds between atoms changes. When the stored energy increases, so does the length of the molecular bonds. As a result, solids typically expand in response to heating and contract on cooling; this dimensional response to temperature change is expressed by its coefficient of thermal expansion.
Different coefficients of thermal expansion can be defined for a substance depending on whether the expansion is measured by:
* linear thermal expansion
* area thermal expansion
* volumetric thermal expansion
These characteristics are closely related. The volumetric thermal expansion coefficient can be defined for both liquids and solids. The linear thermal expansion can only be defined for solids, and is common in engineering applications.
Some substances expand when cooled, such as freezing water, so they have negative thermal expansion coefficients. [Wikipedia]</qudt:description>
</qudt:ThermodynamicsQuantityKind>
</qudt:systemDerivedQuantityKind>
<qudt:systemDerivedQuantityKind>
<qudt:ThermodynamicsQuantityKind rdf:about="http://data.nasa.gov/qudt/owl/quantity#InverseLengthTemperature">
<rdfs:label rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Inverse Length Temperature</rdfs:label>
</qudt:ThermodynamicsQuantityKind>
</qudt:systemDerivedQuantityKind>
<qudt:systemDerivedQuantityKind rdf:resource="http://data.nasa.gov/qudt/owl/quantity#Capacitance"/>
<qudt:systemDerivedQuantityKind rdf:resource="http://data.nasa.gov/qudt/owl/quantity#ElectricChargePerArea"/>
<qudt:systemDerivedQuantityKind rdf:resource="http://data.nasa.gov/qudt/owl/quantity#SpecificEnergy"/>
<qudt:systemDerivedQuantityKind>
<qudt:MechanicsQuantityKind rdf:about="http://data.nasa.gov/qudt/owl/quantity#GravitationalAttraction">
<rdfs:label rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Gravitational Attraction</rdfs:label>
</qudt:MechanicsQuantityKind>
</qudt:systemDerivedQuantityKind>
<qudt:systemDerivedQuantityKind>
<qudt:ChemistryQuantityKind rdf:about="http://data.nasa.gov/qudt/owl/quantity#CatalyticActivity">
<rdfs:label rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Catalytic Activity</rdfs:label>
</qudt:ChemistryQuantityKind>
</qudt:systemDerivedQuantityKind>
<qudt:systemDerivedQuantityKind>
<qudt:ElectricityAndMagnetismQuantityKind rdf:about="http://data.nasa.gov/qudt/owl/quantity#EnergyPerSquareMagneticFluxDensity">
<rdfs:label rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Energy per Square Magnetic Flux Density</rdfs:label>
</qudt:ElectricityAndMagnetismQuantityKind>
</qudt:systemDerivedQuantityKind>
<qudt:systemDerivedQuantityKind>
<qudt:MechanicsQuantityKind rdf:about="http://data.nasa.gov/qudt/owl/quantity#EnergyDensity">
<rdfs:label rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Energy Density</rdfs:label>
<qudt:description rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Energy density is defined as energy per unit volume. The SI unit for energy density is the joule per cubic meter.</qudt:description>
</qudt:MechanicsQuantityKind>
</qudt:systemDerivedQuantityKind>
<qudt:systemDerivedQuantityKind>
<qudt:ChemistryQuantityKind rdf:about="http://data.nasa.gov/qudt/owl/quantity#MolarEnergy">
<rdfs:label rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Molar Energy</rdfs:label>
</qudt:ChemistryQuantityKind>
</qudt:systemDerivedQuantityKind>
<qudt:systemDerivedQuantityKind>
<qudt:ThermodynamicsQuantityKind rdf:about="http://data.nasa.gov/qudt/owl/quantity#AreaThermalExpansion">
<rdfs:label rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Area Thermal Expansion</rdfs:label>
<qudt:description rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>When the temperature of a substance changes, the energy that is stored in the intermolecular bonds between atoms changes. When the stored energy increases, so does the length of the molecular bonds. As a result, solids typically expand in response to heating and contract on cooling; this dimensional response to temperature change is expressed by its coefficient of thermal expansion.
Different coefficients of thermal expansion can be defined for a substance depending on whether the expansion is measured by:
* linear thermal expansion
* area thermal expansion
* volumetric thermal expansion
These characteristics are closely related. The volumetric thermal expansion coefficient can be defined for both liquids and solids. The linear thermal expansion can only be defined for solids, and is common in engineering applications.
Some substances expand when cooled, such as freezing water, so they have negative thermal expansion coefficients. [Wikipedia]</qudt:description>
</qudt:ThermodynamicsQuantityKind>
</qudt:systemDerivedQuantityKind>
<qudt:systemDerivedQuantityKind>
<qudt:ElectricityAndMagnetismQuantityKind rdf:about="http://data.nasa.gov/qudt/owl/quantity#Polarizability">
<rdfs:label rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Polarizability</rdfs:label>
<qudt:description rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Polarizability is the relative tendency of a charge distribution, like the electron cloud of an atom or molecule, to be distorted from its normal shape by an external electric field, which may be caused by the presence of a nearby ion or dipole.

The electronic polarizability α is defined as the ratio of the induced dipole moment of an atom to the electric field that produces this dipole moment. Polarizability is often a scalar valued quantity, however in the general case it is tensor-valued.</qudt:description>
<qudt:symbol rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>α</qudt:symbol>
</qudt:ElectricityAndMagnetismQuantityKind>
</qudt:systemDerivedQuantityKind>
<qudt:systemDerivedQuantityKind>
<qudt:ElectricityAndMagnetismQuantityKind rdf:about="http://data.nasa.gov/qudt/owl/quantity#PowerPerElectricCharge">
<rdfs:label rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Power per Electric Charge</rdfs:label>
</qudt:ElectricityAndMagnetismQuantityKind>
</qudt:systemDerivedQuantityKind>
<qudt:systemBaseQuantityKind rdf:resource="http://data.nasa.gov/qudt/owl/quantity#Dimensionless"/>
<qudt:systemBaseQuantityKind>
<qudt:ChemistryQuantityKind rdf:about="http://data.nasa.gov/qudt/owl/quantity#AmountOfSubstance">
<rdfs:label rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Amount of Substance</rdfs:label>
<qudt:symbol rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>N</qudt:symbol>
</qudt:ChemistryQuantityKind>
</qudt:systemBaseQuantityKind>
<qudt:systemDerivedQuantityKind>
<qudt:ThermodynamicsQuantityKind rdf:about="http://data.nasa.gov/qudt/owl/quantity#AreaTemperature">
<rdfs:label rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Area Temperature</rdfs:label>
</qudt:ThermodynamicsQuantityKind>
</qudt:systemDerivedQuantityKind>
<qudt:systemDerivedQuantityKind>
<qudt:ElectricityAndMagnetismQuantityKind rdf:about="http://data.nasa.gov/qudt/owl/quantity#ElectricChargePerAmountOfSubstance">
<rdfs:label rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Electric Charge per Amount of Substance</rdfs:label>
<rdf:type rdf:resource="http://data.nasa.gov/qudt/owl/qudt#ChemistryQuantityKind"/>
</qudt:ElectricityAndMagnetismQuantityKind>
</qudt:systemDerivedQuantityKind>
<qudt:systemDerivedQuantityKind>
<qudt:MechanicsQuantityKind rdf:about="http://data.nasa.gov/qudt/owl/quantity#AngularMomentum">
<rdfs:label rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Angular Momentum</rdfs:label>
<qudt:description rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>Quantity of rotational motion.
Linear momentum is the quantity obtained by multiplying the mass of a body by its linear velocity. Angular momentum is the quantity obtained by multiplying the moment of inertia of a body by its angular velocity. The momentum of a system of particles is given by the sum of the momenta of the individual particles which make up the system or by the product of the total mass of the system and the velocity of the center of gravity of the system. The momentum of a continuous medium is given by the integral of the velocity over the mass of the medium or by the product of the total mass of the medium and the velocity of the center of gravity of the medium.
In physics, the angular momentum of an object rotating about some reference point is the measure of the extent to which the object will continue to rotate about that point unless acted upon by an external torque. In particular, if a point mass rotates about an axis, then the angular momentum with respect to a point on the axis is related to the mass of the object, the velocity and the distance of the mass to the axis. While the motion associated with linear momentum has no absolute frame of reference, the rotation associated with angular momentum is sometimes spoken of as being measured relative to the fixed stars.</qudt:description>
<qudt:generalization rdf:resource="http://data.nasa.gov/qudt/owl/quantity#Momentum"/>
</qudt:MechanicsQuantityKind>
</qudt:systemDerivedQuantityKind>
<qudt:systemDerivedQuantityKind rdf:resource="http://data.nasa.gov/qudt/owl/quantity#AuxillaryMagneticField"/>