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Absorbed Dose Rate Unit
type: Class
subclass of: Radiology Unit

Absorbed Dose Unit
type: Class
subclass of: Radiology Unit

Acceleration Unit
type: Class
subclass of: Space And Time Unit

Activity Unit
type: Class
subclass of: Radiology Unit

Amount of substance temperature unit
type: Class
subclass of: Chemistry Unit

Amount Of Substance Unit
type: Class
subclass of: Chemistry Unit

Angle unit
description: All units relating to specificaiton of angles.
type: Class
subclass of: Dimensionless Unit
subclass of: Space And Time Unit

Angular Acceleration Unit
type: Class
subclass of: Acceleration Unit

Angular Mass Unit
description: The units of angular mass have dimensions of mass * area. They are used to measure the moment of inertia.
type: Class
subclass of: Mechanics Unit

Angular Momentum Unit
type: Class
subclass of: Momentum Unit

Angular Velocity Unit
type: Class
subclass of: Velocity Unit

Area Angle Unit
type: Class
subclass of: Space And Time Unit

Area Temperature Unit
type: Class
subclass of: Thermodynamics Unit

Area Thermal Expansion Unit
description: 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. For exactly isotropic materials, the area thermal expansion coefficient is very closely approximated as twice the linear coefficient.
type: Class
subclass of: Thermal Expansion Unit

Area Time Temperature Unit
type: Class
subclass of: Thermodynamics Unit

Area Unit
type: Class
subclass of: Space And Time Unit

Atomic Charge Unit
description: The electric charge of an ion, equal to the number of electrons the atom has gained or lost in its ionization multiplied by the charge on one electron. This class contains the following instance(s): "atomic number".
type: Class
subclass of: Atomic Physics Unit

Atomic Mass Unit
type: Class
subclass of: Atomic Physics Unit

Atomic Physics Unit
type: Class
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Base Unit
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type: Class
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Bending Moment Or Torque Unit
type: Class
subclass of: Mechanics Unit

Binary Prefix Unit
type: Class
subclass of: Prefix Unit

Biomedical Unit
type: Class
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subclass of: Science And Engineering Unit

Capacitance Unit
description: Capacitance is a measure of the amount of electric charge stored (or separated) for a given electric potential. This class contains the following instance(s): "Abfarad", "Farad", "MicroFarad", "NanoFarad", "PicoFarad", "Statfarad".
type: Class
subclass of: Electricity And Magnetism Unit

Catalytic Activity Unit
type: Class
subclass of: Chemistry Unit

Chemistry Unit
type: Class
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Coefficient Of Heat Transfer Unit
type: Class
subclass of: Thermodynamics Unit

Communications Unit
type: Class
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Computing Unit
type: Class
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subclass of: Science And Engineering Unit

Concentration Unit
type: Class
subclass of: Chemistry Unit

Conductance Unit
description: Electrical conductance is the inverse of electrical resistance. It measures the ease with which electricity flows along a path through an electrical element. This class contains the following instance(s): "Abmho", "Mho", "Siemens", "Statmho".
type: Class
subclass of: Electricity And Magnetism Unit

Counting Unit
description: All units about counts. Examples are Atomic Number, Number, Number per Year, Percent and Sample per Second.
type: Class
subclass of: Dimensionless Unit
subclass of: Resource Unit

Currency Unit
type: Class
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subclass of: Financial Unit

Current Per Angle Unit
type: Class
subclass of: Electricity And Magnetism Unit

Curvature Unit
description: The canonicall 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]
type: Class
subclass of: Space And Time Unit

Data Rate Unit
type: Class
subclass of: Computing Unit
subclass of: Resource Unit

Decimal Prefix Unit
type: Class
subclass of: Prefix Unit
subclass of: SI Unit

Derived Unit
description: A DerivedUnit is a type specification for units that are derived from other units.
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type: Class
type: DeprecatedClass
subclass of: Unit

Dimensionless Unit
description: A Dimensionless Unit is a quantity for which all the exponents of the factors corresponding to the base quantities in its quantity dimension are zero.
type: Class
subclass of: Unit

Dose Equivalent Unit
type: Class
subclass of: Radiology Unit

Dynamic Viscosity Unit
type: Class
subclass of: Mechanics Unit

Electric Charge Area Density Unit
type: Class
subclass of: Electric Charge Density Unit

Electric Charge Density Unit
description: The linear, surface, or volume charge density is the amount of electric charge in a line, surface, or volume. It is measured in coulombs per metre (C/m), square metre (C/m^2), or cubic metre (C/m^3), respectively. Since there are positive as well as negative charges, the charge density can take on negative values. [Wikipedia]
type: Class
subclass of: Electricity And Magnetism Unit

Electric Charge Line Density Unit
description: The linear charge density is the amount of electric charge in a line. It is measured in coulombs per metre (C/m). Since there are positive as well as negative charges, the charge density can take on negative values. [Wikipedia]
type: Class
subclass of: Electric Charge Density Unit

Electric Charge Per Amount Of Substance Unit
type: Class
subclass of: Electrochemistry Unit

Electric Charge Unit
description: 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 interaction between a moving charge and an electromagnetic field is the source of the electromagnetic force, which is one of the four fundamental forces.
type: Class
subclass of: Electricity And Magnetism Unit

Electric Charge Volume Density Unit
description: The volume charge density is the amount of electric charge in a volume. It is measured in coulombs per cubic metre (C/m^3). Since there are positive as well as negative charges, the charge density can take on negative values. [Wikipedia]
type: Class
subclass of: Electric Charge Density Unit

Electric Current Density Unit
description: Electric current density is a measure of the density of flow of a conserved charge. Usually the charge is the electric charge, in which case the associated current density is the electric current per unit area of cross section, but the term current density can also be applied to other conserved quantities. It is defined as a vector whose magnitude is the current per cross-sectional area. [Wikipedia] In SI units, the electric current density is measured in amperes per square metre. This class contains the following instance(s): "Ampere per square meter".
type: Class
subclass of: Electricity And Magnetism Unit

Electric Current Unit
description: Electric current is the flow (movement) of electric charge. The SI unit of electric current is the ampere, and electric current is measured using an ammeter. This class contains the following instance(s): "Abampere", "Ampere", "Biot", "Statampere".
type: Class
subclass of: Electricity And Magnetism Unit

Electric Dipole Moment Unit
description: The electric dipole moment (or electric dipole for short) is a measure of the polarity of a system of electric charges. [Wikipedia] This class has the following instance(s): "Coulomb meter", "Debye".
type: Class
subclass of: Electricity And Magnetism Unit

Electric Field Strength Unit
description: The strength of the electric field at a given point is defined as the force that would be exerted on a positive test charge of +1 coulomb placed at that point; the direction of the field is given by the direction of that force. Electric fields contain electrical energy with energy density proportional to the square of the field intensity. The electric field is to charge as gravitational acceleration is to mass and force density is to volume.
type: Class
subclass of: Electricity And Magnetism Unit

Electric Flux Density Unit
type: Class
subclass of: Electric Charge Density Unit

Electric Flux Unit
type: Class
subclass of: Electricity And Magnetism Unit

Electricity And Magnetism Unit
description: The class of units used to measure the properties of electricity and magnetism.
type: Class
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Electrochemistry Unit
type: Class
subclass of: Chemistry Unit
subclass of: Electricity And Magnetism Unit

Energy and work per mass amount of substance
type: Class
subclass of: Chemistry Unit

Energy And Work Unit
type: Class
subclass of: Mechanics Unit

Energy Density Unit
description: Units that measure energy density, i.e. energy per unit volume.
type: Class
subclass of: Mechanics Unit

Energy Per Area Unit
description: Units that quantify energy per unit area.
type: Class
subclass of: Mechanics Unit

Energy per Electric Charge Unit
description: The ratio of energy to electric charge arises repeatedly in electrodynamics. It is the dimensional equivalent to the electrostatic potential and electromotive force. In both cases, the SI unit is the volt, or newton meters per coulomb.
type: Class
subclass of: Electricity And Magnetism Unit

Enumerated Value
description: This class is for all enumerated and/or coded values. For example, it contains the dimension objects that are the basis elements in some abstract vector space associated with a quantity kind system. Another use is for the base dimensions for quantity systems. Each quantity kind system that defines a base set has a corresponding ordered enumeration whose elements are the dimension objects for the base quantity kinds. The order of the dimensions in the enumeration determines the canonical order of the basis elements in the corresponding abstract vector space.
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Enumeration
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subclass of: Enumeration

Event Unit
type: Class
subclass of: Resource Unit

Exposure Unit
type: Class
subclass of: Radiology Unit

Financial Unit
description: This class contains units that measure financial quantities, such as currency, transactions, rates of return, etc.
type: Class
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subclass of: Resource Unit

Force Per Electric Charge Unit
type: Class
subclass of: Electricity And Magnetism Unit

Force Per Length Unit
type: Class
subclass of: Mechanics Unit

Force Unit
type: Class
subclass of: Mechanics Unit

Frequency Unit
type: Class
subclass of: Space And Time Unit

Gravitational Attraction Unit
type: Class
subclass of: Mechanics Unit

Heart Rate Unit
type: Class
subclass of: Biomedical Unit

Heat Capacity And Entropy Unit
type: Class
subclass of: Thermodynamics Unit

Heat Flow Rate Unit
type: Class
subclass of: Thermodynamics Unit

Human Unit
description: units for measuring human resources
type: Class
subclass of: http://lodlaundromat.org/.well-known/genid/5eba8bab89380303fab69e3d8b24ab2f#45
subclass of: Resource Unit

Illuminance Unit
type: Class
subclass of: Photometry Unit

Inductance Unit
description: An electric current flowing around a circuit produces a magnetic field and hence a magnetic flux through the circuit. The ratio of the magnetic flux to the current is called the inductance, or more accurately self-inductance of the circuit. [Wikipedia] This class contains the following instance(s): "Abhenry", "Henry", "Micro Henry", "Milli Henry", "Stathenry".
type: Class
subclass of: Electricity And Magnetism Unit

Information Entropy Unit
type: Class
subclass of: Computing Unit
subclass of: Logarithmic Unit
subclass of: Resource Unit

Inverse Amount Of Substance Unit
type: Class
subclass of: Chemistry Unit

Kinematic Viscosity Unit
type: Class
subclass of: Mechanics Unit

Length Temperature Time Unit
type: Class
subclass of: Thermodynamics Unit

Length Temperature Unit
type: Class
subclass of: Thermodynamics Unit

Length Unit
type: Class
subclass of: Space And Time Unit

Linear Acceleration Unit
type: Class
subclass of: Acceleration Unit

Linear Energy Transfer Unit
type: Class
subclass of: Atomic Physics Unit

Linear Momentum Unit
type: Class
subclass of: Momentum Unit

Linear Thermal Expansion Unit
description: 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]
type: Class
subclass of: Thermal Expansion Unit

Linear Velocity Unit
description: Linear Velocity units measure change of length per unit time. Examples include meters per second, miles per hour, knots, etc.
type: Class
subclass of: Velocity Unit

Logarithmic Unit
description: Logarithmic units are abstract mathematical units that can be used to express any quantities (physical or mathematical) that are defined on a logarithmic scale, that is, as being proportional to the value of a logarithm function. Examples of logarithmic units include common units of information and entropy, such as the bit, and the byte, as well as units of relative signal strength magnitude such as the decibel.
type: Class
subclass of: Physical Unit

Luminance Unit
type: Class
subclass of: Photometry Unit

Luminous Efficacy Unit
type: Class
subclass of: Photometry Unit

Luminous Energy Unit
type: Class
subclass of: Photometry Unit

Luminous Flux Unit
type: Class
subclass of: Photometry Unit

Luminous Intensity Unit
type: Class
subclass of: Photometry Unit

Magnetic Field Strength Unit
description: A magnetic field is a vector field that permeates space and which can exert a magnetic force on moving electric charges and on magnetic dipoles (such as permanent magnets). [Wikipedia] The strength of a magnetic field at a point in space is the magnitude of the field vector at that point. This class contains the following instance(s): "Ampere per meter", "Ampere turn per inch", "Ampere turn per meter", "Oersted".
type: Class
subclass of: Electricity And Magnetism Unit

Magnetic Flux Density Unit
type: Class
subclass of: Electricity And Magnetism Unit

Magnetic Flux Unit
description: Magnetic flux is a measure of quantity of magnetism, taking into account the strength and the extent of a magnetic field. The SI unit of magnetic flux is the weber (in derived units: volt-seconds), and the unit of magnetic field is the weber per square meter, or tesla. [Wikipedia] This class contains the following instance(s): "Maxwell", "Unit pole", "Weber".
type: Class
subclass of: Electricity And Magnetism Unit

Magnetomotive Force Unit
description: Magnetomotive force is any physical cause that produces magnetic flux. In other words, it is a field of magnetism (measured in tesla) that has area (measured in square meters), so that (Tesla)(Area)= Flux. It is analogous to electromotive force or voltage in electricity. MMF usually describes electric wire coils in a way so scientists can measure or predict the actual force a wire coil can generate. [Wikipedia] This class contains the following instance(s): "Ampere turn", "Gilbert", "Oersted centimeter", "Unit pole".
type: Class
subclass of: Electricity And Magnetism Unit

Mass Amount Of Substance Temperature Unit
type: Class
subclass of: Chemistry Unit

Mass Amount Of Substance Unit
type: Class
subclass of: Chemistry Unit

Mass Per Area Unit
type: Class
subclass of: Mechanics Unit

Mass Per Length Unit
type: Class
subclass of: Mechanics Unit

Mass Per Time Unit
type: Class
subclass of: Mechanics Unit

Mass Per Volume Unit
type: Class
subclass of: Mechanics Unit

Mass Temperature Unit
type: Class
subclass of: Thermodynamics Unit

Mass Unit
type: Class
subclass of: Mechanics Unit

Mechanics Unit
type: Class
subclass of: http://lodlaundromat.org/.well-known/genid/5eba8bab89380303fab69e3d8b24ab2f#39
subclass of: Physical Unit

Microbial Formation Unit
type: Class
subclass of: Biomedical Unit

Molal Concentration Unit
type: Class
subclass of: Concentration Unit

Molar Concentration Unit
type: Class
subclass of: Concentration Unit

Molar Energy Unit
type: Class
subclass of: Chemistry Unit

Molar Heat Capacity Unit
type: Class
subclass of: Thermodynamics Unit

Momentum Unit
type: Class
subclass of: Mechanics Unit

Non SI Unit
description: A Non-SI unit. Typically an imperial measure.
type: Class
type: DeprecatedClass
subclass of: Physical Unit
disjoint with: SI Unit

Not Used With SI Unit
description: A type specification for all units that are not used in the SI standard.
type: Class
type: DeprecatedClass
subclass of: Non SI Unit
disjoint with: Used With SI Unit

Light Unit
type: Class
subclass of: Electricity And Magnetism Unit

Permeability Unit
type: Class
subclass of: Electricity And Magnetism Unit

Permittivity Unit
type: Class
subclass of: Electricity And Magnetism Unit

Photometry Unit
type: Class
subclass of: Light Unit

Physical Unit
type: Class
subclass of: http://lodlaundromat.org/.well-known/genid/5eba8bab89380303fab69e3d8b24ab2f#16
subclass of: Science And Engineering Unit

Plane Angle Unit
type: Class
subclass of: Angle unit

Power Per Area Unit
type: Class
subclass of: Mechanics Unit

Energy per Electric Charge Unit
description: The ratio of power to electric charge is proportional to the rate of change of electric potential.
type: Class
subclass of: Electricity And Magnetism Unit

Power Unit
type: Class
subclass of: Mechanics Unit

Prefix Unit
description: Prefixes are either binary or decimal.
type: Class
subclass of: Dimensionless Unit

Pressure or stress rate
type: Class
subclass of: Mechanics Unit

Pressure Or Stress Unit
type: Class
subclass of: Mechanics Unit

Quantity Kind Category
type: Class
subclass of: Class

RF-Power Unit
type: Class
subclass of: Communications Unit

Radiance Unit
type: Class
subclass of: Radiometry Unit

Radiant Intensity Unit
type: Class
subclass of: Radiometry Unit

Radiology Unit
type: Class
subclass of: http://lodlaundromat.org/.well-known/genid/5eba8bab89380303fab69e3d8b24ab2f#19
subclass of: Physical Unit

Radiometry Unit
type: Class
subclass of: Light Unit

Rate Of Return Unit
type: Class
subclass of: Financial Unit

Resistance Unit
description: Electrical resistance is a ratio of the degree to which an object opposes an electric current through it, measured in ohms. Its reciprocal quantity is electrical conductance measured in siemens. This class contains the following instance(s): "Abohm", "Ohm", "Statohm".
type: Class
subclass of: Electricity And Magnetism Unit

Resource Unit
description: A Resource Unit is a unit for measuring the amount of various types of resources.
type: Class
subclass of: Unit

Respiratory Rate Unit
type: Class
subclass of: Biomedical Unit

SI Base Unit
description: All SI units are derived from the SI Base units
type: http://lodlaundromat.org/.well-known/genid/5eba8bab89380303fab69e3d8b24ab2f#53
type: Class
type: DeprecatedClass
subclass of: Base Unit
subclass of: SI Unit
disjoint with: SI Derived Unit

SI Derived Unit
type: Class
type: DeprecatedClass
subclass of: Derived Unit
subclass of: SI Unit
disjoint with: SI Base Unit

SI Unit
description: An SI unit
type: Class
type: DeprecatedClass
subclass of: Physical Unit

Science And Engineering Unit
type: Class
subclass of: http://lodlaundromat.org/.well-known/genid/5eba8bab89380303fab69e3d8b24ab2f#36
subclass of: Unit

Serum Or Plasma Level Unit
type: Class
subclass of: Biomedical Unit

Signal Detection Threshold Unit
description: Signal relative to an underlying signal
type: Class
subclass of: Communications Unit

Solid Angle Unit
description: The solid angle subtended by a surface S is defined as the surface area of a unit sphere covered by the surface S's projection onto the sphere. A solid angle is related to the surface of a sphere in the same way an ordinary angle is related to the circumference of a circle. Since the total surface area of the unit sphere is 4*pi, the measure of solid angle will always be between 0 and 4*pi.
type: Class
subclass of: Angle unit

Space And Time Unit
type: Class
subclass of: http://lodlaundromat.org/.well-known/genid/5eba8bab89380303fab69e3d8b24ab2f#34
subclass of: Physical Unit

Specific Energy Unit
description: Units which quantify specific energy, i.e. energy per unit mass.
type: Class
subclass of: Mechanics Unit

Specific Heat Capacity Unit
type: Class
subclass of: Thermodynamics Unit

Specific Heat Pressure Unit
description: This class contains units of measure for specific heat capacity at a constant pressure.
type: Class
subclass of: Thermodynamics Unit

Specific Heat Volume Unit
description: This class contains units of measure for specific heat capacity at a constant volume.
type: Class
subclass of: Thermodynamics Unit

System of natural units
description: In physics, natural units are physical units of measurement based only on universal physical constants. For example the elementary charge e is a natural unit of electric charge, or the speed of light c is a natural unit of speed. A purely natural system of units is defined in such a way that some set of selected universal physical constants are normalized to unity; that is, their numerical values in terms of these units become exactly 1. Examples are Planck Units and Atomic Units. Atomic units (au or a.u.) form a system of natural units which is especially convenient for atomic physics calculations. There are two different kinds of atomic units, which one might name Hartree atomic units[1] and Rydberg atomic units, which differ in the choice of the unit of mass and charge. Planck units are unique among systems of natural units, because they are not defined in terms of properties of any prototype, physical object, or even elementary particle. [Wikipeda]
type: Class
subclass of: System of Units

System of Units
description: A system of units is a set of units which are chosen as the reference scales for some set of quantity kinds together with the definitions of each unit. Units may be defined by experimental observation or by proportion to another unit not included in the system. If the unit system is explicitly associated with a quantity kind system, then the unit system must define at least one unit for each quantity kind.
type: Class
subclass of: http://lodlaundromat.org/.well-known/genid/5eba8bab89380303fab69e3d8b24ab2f#40
subclass of: http://lodlaundromat.org/.well-known/genid/5eba8bab89380303fab69e3d8b24ab2f#46
subclass of: http://lodlaundromat.org/.well-known/genid/5eba8bab89380303fab69e3d8b24ab2f#51

Temperature per time unit
type: Class
subclass of: Thermodynamics Unit

Temperature Unit
type: Class
subclass of: Thermodynamics Unit

Thermal Conductivity Unit
type: Class
subclass of: Thermodynamics Unit

Thermal Diffusivity Unit
type: Class
subclass of: Thermodynamics Unit

Thermal Energy Length Unit
type: Class
subclass of: Thermodynamics Unit

Thermal Energy Unit
type: Class
subclass of: Thermodynamics Unit

Thermal Expansion Unit
description: 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]
type: Class
subclass of: Thermodynamics Unit

Thermal Insulance Unit
type: Class
subclass of: Thermodynamics Unit

Thermal Resistance Unit
type: Class
subclass of: Thermodynamics Unit

Thermal Resistivity Unit
type: Class
subclass of: Thermodynamics Unit

Thermodynamics Unit
description: Thermodynamics units are units that provide reference scales for quantifying the conversion of energy into work, as well as heat and its relation to macroscopic variables such as temperature and pressure.
type: Class
subclass of: http://lodlaundromat.org/.well-known/genid/5eba8bab89380303fab69e3d8b24ab2f#48
subclass of: Physical Unit

Thrust To Mass Ratio Unit
type: Class
subclass of: Mechanics Unit

Time Area Unit
type: Class
subclass of: Space And Time Unit

Time Squared Unit
type: Class
subclass of: Space And Time Unit

Time Unit
description: Units that measure time.
type: Class
subclass of: Space And Time Unit

Turbidity Unit
description: Turbidity is the cloudiness or haziness of a fluid caused by individual particles (suspended solids) that are generally invisible to the naked eye, similar to smoke in air.
type: Class
subclass of: Biomedical Unit

Unit
description: A unit of measure, or unit, is a particular quantity value that has been chosen as a scale for measuring other quantities the same kind (more generally of equivalent dimension). For example, the meter is a quantity of length that has been rigorously defined and standardized by the BIPM (International Board of Weights and Measures). Any measurement of the length can be expressed as a number multiplied by the unit meter. More formally, the value of a physical quantity Q with respect to a unit (U) is expressed as the scalar multiple of a real number (n) and U, as Q = nU.
type: Class
subclass of: http://lodlaundromat.org/.well-known/genid/5eba8bab89380303fab69e3d8b24ab2f#10
subclass of: http://lodlaundromat.org/.well-known/genid/5eba8bab89380303fab69e3d8b24ab2f#11
subclass of: http://lodlaundromat.org/.well-known/genid/5eba8bab89380303fab69e3d8b24ab2f#12
subclass of: http://lodlaundromat.org/.well-known/genid/5eba8bab89380303fab69e3d8b24ab2f#13
subclass of: http://lodlaundromat.org/.well-known/genid/5eba8bab89380303fab69e3d8b24ab2f#14
subclass of: http://lodlaundromat.org/.well-known/genid/5eba8bab89380303fab69e3d8b24ab2f#15
subclass of: http://lodlaundromat.org/.well-known/genid/5eba8bab89380303fab69e3d8b24ab2f#8
subclass of: http://lodlaundromat.org/.well-known/genid/5eba8bab89380303fab69e3d8b24ab2f#9
subclass of: Thing

Used With SI Unit
description: A type specification for all units that are used in the SI standard.
type: Class
type: DeprecatedClass
subclass of: Non SI Unit
disjoint with: Not Used With SI Unit

Velocity Unit
type: Class
subclass of: Space And Time Unit

Video Frame Rate Unit
type: Class
subclass of: Computing Unit

Volume per mass unit
type: Class
subclass of: Mechanics Unit

Volume per Time Squared Unit
type: Class
subclass of: Mechanics Unit

Volume Per Time Unit
description: A "Space And Time" Unit with the following instance(s): "Cubic foot per minute", "Cubic foot per second", "Cubic inch per minute", "Cubic meter per second", "Cubic yard per minute", "Gallon per day", "Gallon per minute".
type: Class
subclass of: Space And Time Unit

Volume Thermal Expansion Unit
description: 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. For exactly isotropic materials, the volumetric thermal expansion coefficient is very closely approximated as three times the linear coefficient. [Wikipedia]
type: Class
subclass of: Thermal Expansion Unit

Volume Unit
type: Class
subclass of: Space And Time Unit

abbreviation
description: An abbreviation for a unit is a short (usually 5 characters or less) string that is used in place of the full name for the unit in contexts where space is limited, or where using the abbreviation will enhance readability.
type: DatatypeProperty
range: string

allowed unit of system
description: This property relates a unit of measure with a unit system that does not define the unit, but allows its use within the system. An allowed unit must be convertible to some dimensionally eqiuvalent unit that is defined by the system.
type: ObjectProperty
sub property of: unit of system
inverse of: allowed unit

base dimension enumeration
description: This property associates a system of quantities with an enumeration that enumerates the base dimensions of the system in canonical order.
type: FunctionalProperty
type: ObjectProperty

base quantity kind of system
type: ObjectProperty
sub property of: quantity kind of system
inverse of: system base quantity kind

base unit of system
description: This property relates a unit of measure to the system of units in which it is defined as a base unit for the system. The base units of a system are used to define the derived units of the system by expressing the derived units as products of the base units raised to a rational power.
type: ObjectProperty
sub property of: coherent unit of system
inverse of: base unit

basis element
type: FunctionalProperty
type: ObjectProperty

code
description: A unit code is a numeric string that uniquely identifies a unit
type: DatatypeProperty
range: string

derived unit of system
description: This property relates a unit of measure to the unit system in which the unit is derived from the system's base units with a proportionality constant of one.
type: ObjectProperty
sub property of: coherent unit of system
sub property of: derived unit of system
inverse of: coherent derived unit

coherent unit of system
description: A coherent unit of measurement for a unit system is a defined unit that may be expressed as a product of powers of the system's base units with the proportionality factor of one.
type: DeprecatedProperty
type: ObjectProperty
sub property of: defined unit of system
inverse of: coherent unit

coherent unit system
description: A system of units is coherent with respect to a system of quantities and equations if the system of units is chosen in such a way that the equations between numerical values have exactly the same form (including the numerical factors) as the corresponding equations between the quantities. In such a coherent system, no numerical factor other than the number 1 ever occurs in the expressions for the derived units in terms of the base units.
type: FunctionalProperty
type: ObjectProperty
sub property of: unit system

conversion coefficient
type: DatatypeProperty
range: double

conversion multiplier
type: DatatypeProperty
type: FunctionalProperty
range: double

conversion offset
type: DatatypeProperty
type: FunctionalProperty
range: double

currency exponent
description: The currency exponent indicates the number of decimal places between a major currency unit and its minor currency unit. For example, the US dollar is the major currency unit of the United States, and the US cent is the minor currency unit. Since one cent is 1/100 of a dollar, the US dollar has a currency exponent of 2. However, the Japanese Yen has no minor currency units, so the yen has a currency exponent of 0.
type: DatatypeProperty
type: FunctionalProperty
range: integer

default
description: The default element in an enumeration
type: ObjectProperty

defined unit of system
description: This property relates a unit of measure with the unit system that defines the unit.
type: ObjectProperty
sub property of: unit of system
inverse of: defined unit

derived quantity kind of system
type: ObjectProperty
sub property of: quantity kind of system
inverse of: system derived quantity kind

derived unit of system
description: This property relates a unit of measure to the system of units in which it is defined as a derived unit. That is, the derived unit is defined as a product of the base units for the system raised to some rational power.
type: ObjectProperty
sub property of: defined unit of system
inverse of: derived unit

description
type: DatatypeProperty
range: string1024
sub property of: description

dimension inverse
type: FunctionalProperty
type: InverseFunctionalProperty
type: ObjectProperty
type: SymmetricProperty

element
description: An element of an enumeration
type: ObjectProperty

element kind
type: ObjectProperty

exact constant
type: DatatypeProperty
range: boolean

exact match
type: ObjectProperty
type: SymmetricProperty
type: TransitiveProperty

float percentage
type: Datatype
subclass of: float
equivalent class: http://lodlaundromat.org/.well-known/genid/5eba8bab89380303fab69e3d8b24ab2f#38

generalization
description: This property relates a quantity kind to its generalization. A quantity kind, PARENT, is a generalization of the quantity kind CHILD only if 1. PARENT and CHILD have the same dimensions in every system of quantities; 2. Every unit that is a measure of quantities of kind CHILD is also a valid measure of quantities of kind PARENT.
type: ObjectProperty
inverse of: specialization

integer percentage
type: Datatype
subclass of: integer
equivalent class: http://lodlaundromat.org/.well-known/genid/5eba8bab89380303fab69e3d8b24ab2f#4

literal
type: DatatypeProperty
range: string

negative delta limit
description: A negative change limit between consecutive sample values for a parameter. The Negative Delta may be the encoded value or engineering units value depending on whether or not a Calibrator is defined.
type: DatatypeProperty
range: string

numeric value
type: DatatypeProperty
range: double

order
type: DatatypeProperty
range: nonNegativeInteger

Positive delta limit
description: A positive change limit between consecutive sample values for a parameter. The Positive Delta may be the encoded value or engineering units value depending on whether or not a Calibrator is defined.
type: DatatypeProperty
range: string

prefix unit of system
type: DeprecatedProperty
type: ObjectProperty
sub property of: defined unit of system
inverse of: prefix unit

quantity
description: a property to relate an observable thing with a quantity (qud:Quantity)
type: ObjectProperty

quantity kind
type: ObjectProperty

quantity kind of system
type: ObjectProperty
inverse of: system quantity kind

quantity value
type: ObjectProperty
inverse of: value for quantity

reference thing
type: ObjectProperty

reference unit
type: FunctionalProperty
type: ObjectProperty
sub property of: reference thing

relative standard uncertainty
description: The relative standard uncertainty of a measurement is the (absolute) standard uncertainty divided by the magnitude of the exact value.
type: DatatypeProperty
range: double

specialization
description: This property relates a quantity kind to its specialization(s). For example, linear velocity and angular velocity are both specializations of velocity.
type: ObjectProperty
inverse of: generalization

standard uncertainty
description: The standard uncertainty of a quantity is the estimated standard deviation of the mean taken from a series of measurements.
type: DatatypeProperty
range: double

string1024
type: Datatype
subclass of: string
equivalent class: http://lodlaundromat.org/.well-known/genid/5eba8bab89380303fab69e3d8b24ab2f#24

symbol
description: The symbol for a unit is a glyph that is used to represent the unit in a compact form. For example, the symbol for the US Dollar is $. This contrasts with unit:abbreviation, which gives a short alphanumeric abbreviation for the unit. (I.e. USD for US Dollar).
type: DatatypeProperty
range: string
sub property of: literal

allowed unit
description: This property relates a unit system with a unit of measure that is not defined by or part of the system, but is allowed for use within the system. An allowed unit must be convertible to some dimensionally eqiuvalent unit that is defined by the system.
type: DeprecatedProperty
type: ObjectProperty
sub property of: system unit
inverse of: allowed unit of system

system base quantity kind
type: ObjectProperty
sub property of: system quantity kind
inverse of: base quantity kind of system

base unit
description: This property relates a system of units to a base unit defined within the system. The base units of a system are used to define the derived units of the system by expressing the derived units as products of the base units raised to a rational power.
type: ObjectProperty
sub property of: coherent unit
inverse of: base unit of system

coherent derived unit
type: ObjectProperty
sub property of: coherent unit
sub property of: derived unit
inverse of: derived unit of system

coherent unit
description: A coherent unit of measurement for a unit system is a defined unit that may be expressed as a product of powers of the system's base units with the proportionality factor of one.
type: DeprecatedProperty
type: ObjectProperty
sub property of: defined unit
inverse of: coherent unit of system

defined unit
description: This property relates a unit system with a unit of measure that is defined by the system.
type: ObjectProperty
sub property of: system unit

system derived quantity kind
type: ObjectProperty
sub property of: system quantity kind
inverse of: derived quantity kind of system

derived unit
description: This property relates a system of units to a unit of measure that is defined within the system in terms of the base units for the system. That is, the derived unit is defined as a product of the base units for the system raised to some rational power.
type: ObjectProperty
sub property of: defined unit

system dimension
type: ObjectProperty

prefix unit
type: DeprecatedProperty
type: ObjectProperty
sub property of: defined unit
inverse of: prefix unit of system

system quantity kind
type: ObjectProperty
inverse of: quantity kind of system

system unit
description: This property relates a system of units with a unit of measure that is either a) defined by the system, or b) accepted for use by the system and is convertible to a unit of equivalent dimension that is defined by the system. Systems of units may distinguish between base and derived units. Base units are the units which measure the base quantities for the corresponding system of quantities. The base units are used to define units for all other quantities as products of powers of the base units. Such units are called derived units for the system.
type: ObjectProperty
inverse of: unit of system

type prefix
type: DatatypeProperty
range: string

UNECE common code
type: DatatypeProperty
range: string

unit
description: A reference to the unit of measure of a quantity (variable or constant) of interest.
type: ObjectProperty
range: Unit
inverse of: unit for

unit for
type: ObjectProperty
inverse of: unit

unit of system
description: This property relates a unit of measure with a system of units that either a) defines the unit or b) allows the unit to be used within the system.
type: ObjectProperty
inverse of: system unit

unit system
type: FunctionalProperty
type: ObjectProperty

value
description: A property to relate an observable thing with a quantity value (qud:QuantityValue)
type: ObjectProperty

value for quantity
type: ObjectProperty
inverse of: quantity value

vector magnitude
type: DatatypeProperty
type: FunctionalProperty
range: float

Quantities, Units, Dimensions and Types (QUDT) Ontology Version 1.1
contributor: Daniel Mekonnen
contributor: David Price
contributor: Irene Polikoff
contributor: Ralph Hodgson
creator: James E. Masters
rights: 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.
subject: Quantities, Units, Dimensions and Types
has license type: CC-SHAREALIKE 3PT0-US
with attribution to: NASA-ARC-Attribution
with attribution to: TopQuadrantAttribution
acronym: QUDT
date created: 2011-01-06T09:30:49
description: The QUDT, or 'Quantity, Unit, Dimension and Type' collection of ontologies define the base classes properties, and restrictions used for modeling physical quantities, units of measure, and their dimensions in various measurement systems. The goal of the QUDT ontology is to provide a unified model of, measurable quantities, units for measuring different kinds of quantities, the numerical values of quantities in different units of measure and the data structures and data types used to store and manipulate these objects in software. This OWL schema is a foundation for a basic treatment of units.
has aspect scope: Basic treatment of quantities and units. No dimensional treatment in this graph.
has catalog entry: QUDT-SchemaCatalogEntry
has discipline scope: All disciplines
has domain scope: Science, Medicine and Engineering
has role: SchemaGraph
intent: Provides a schema for describing Units of Measure
last updated: $LastChangedDate: 2011-06-01 14:56:40 -0700 (Wed, 01 Jun 2011) $
namespace prefix: qudt
revision number: 1.1
specificity: 1
uses non imported resource: author
uses non imported resource: contributor
uses non imported resource: creator
uses non imported resource: description
uses non imported resource: rights
uses non imported resource: subject
uses non imported resource: title
uses non imported resource: closeMatch
uses non imported resource: exactMatch
uses non imported resource: CC-SHAREALIKE 3PT0-US
type: Ontology
label: Quantities, Units, Dimensions and Types (QUDT) - Level 1
imports: dtype
imports: vaem
version IRI: qudt
version info: $Id: OSG_qudt-(v1.1).ttl 4989 2011-06-01 21:56:40Z RalphHodgson $

with attribution to
type: ObjectProperty