@id,qudt:abbreviation,qudt:description,qudt:generalization,qudt:specialization,qudt:symbol,rdf:type,rdfs:label,skos:closeMatch,skos:exactMatch,skos:topConceptOf
,"",'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.'^^xsd:string,,"","",qudt:QuantityKind,'Absolute Humidity'^^xsd:string,,,""
,"","'Absorbed dose (also known as Total Ionizing Dose, TID) is a measure of the energy deposited in a medium by ionizing radiation. It is equal to the energy deposited per unit mass of medium, and so has the unit J/kg, which is given the special name Gray (Gy).
Note that the absorbed dose is not a good indicator of the likely biological effect. 1 Gy of alpha radiation would be much more biologically damaging than 1 Gy of photon radiation for example. Appropriate weighting factors can be applied reflecting the different relative biological effects to find the equivalent dose.
The risk of stoctic effects due to radiation exposure can be quantified using the effective dose, which is a weighted average of the equivalent dose to each organ depending upon its radiosensitivity. When ionising radiation is used to treat cancer, the doctor will usually prescribe the radiotherapy treatment in Gy. When risk from ionising radiation is being discussed, a related unit, the Sievert is used.'^^xsd:string",,"","",qudt:QuantityKind|qudt:RadiologyQuantityKind,'Absorbed Dose'^^xsd:string,"",|,""
,"","","","","",qudt:QuantityKind|qudt:RadiologyQuantityKind,'Absorbed Dose Rate'^^xsd:string,"",,
,"","'Acceleration is the (instantaneous) rate of change of velocity. Acceleration may be either linear acceleration, or angular acceleration. It is a vector quantity with dimension length/time^2 for linear acceleration, or in the case of angular acceleration, with dimension angle/time^2. In SI units, linear acceleration is measured in meters/second^2 (m·s^-2) and angular acceleration is measured in radians/second^2.
In common speech, the term acceleration is only used for an increase in speed. In physics, any increase or decrease in speed is referred to as acceleration and similarly, motion in a circle at constant speed is also an acceleration, since the direction component of the velocity is changing.'^^xsd:string","",|,"",qudt:SpaceAndTimeQuantityKind|qudt:QuantityKind,'Acceleration'^^xsd:string,"",|,
,'S'^^xsd:string,"","","",'S'^^xsd:string,qudt:QuantityKind|qudt:QuantumMechanicsQuantityKind,'Action'^^xsd: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.'^^xsd:string",,"","",qudt:QuantityKind|qudt:QuantumMechanicsQuantityKind,'Activity'^^xsd:string,"",|,""
,"","","","",'N'^^xsd:string,qudt:ChemistryQuantityKind|qudt:QuantityKind,'Amount of Substance'^^xsd:string,"",|,
,"","",,"","",qudt:ChemistryQuantityKind|qudt:QuantityKind,'Amount of substance per unit mass'^^xsd:string,"",,""
,"","",,,"",qudt:ChemistryQuantityKind|qudt:QuantityKind,'Amount of Substance Per Unit Volume'^^xsd:string,"",,""
,"","'The inclination to each other of two intersecting lines, measured by the arc of a circle intercepted between the two lines forming the angle, the center of the circle being the point of intersection. An acute angle is less than 90°; a right angle 90 °; an obtuse angle, more than 90° but less than 180 °; a straight angle, 180°; a reflex angle, more than 180° but less than 360°; a perigon, 360°. Any angle not a multiple of 90° is an oblique angle. If the sum of two angles is 90°, they are complementary angles; if 180°, supplementary angles; if 360°, explementary angles. Two adjacent angles have a common vertex and lie on opposite sides of a common side. A dihedral angle is the angle between two intersecting planes. A spherical angle is the angle between two intersecting great circles.'^^xsd:string",,|,"",qudt:SpaceAndTimeQuantityKind|qudt:QuantityKind,'Angle'^^xsd:string,"",|,""
,"","'Angular acceleration is the rate of change of angular velocity over time. Measurement of the change made in the rate of change of an angle that a spinning object undergoes per unit time. It is a vector quantity. Also called Rotational acceleration.
In SI units, it is measured in radians per second squared (rad/s^2), and is usually denoted by the Greek letter alpha.'^^xsd:string",,"","",qudt:SpaceAndTimeQuantityKind|qudt:QuantityKind,'Angular Acceleration'^^xsd:string,"",|,""
,"",'Angular frequency is a scalar measure of rotation rate. It is the magnitude of the vector quantity angular velocity. '^^xsd:string,,"",'ω'^^xsd:string,qudt:SpaceAndTimeQuantityKind|qudt:QuantityKind,'Angular Frequency'^^xsd: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.'^^xsd:string",,"","",qudt:MechanicsQuantityKind|qudt:QuantityKind,'Angular Momentum'^^xsd:string,"",|,""
,"","'The change of angle per unit time; specifically, in celestial mechanics, the change in angle of the radius vector per unit time.'^^xsd:string",,,"",qudt:SpaceAndTimeQuantityKind|qudt:QuantityKind,'Angular Velocity'^^xsd: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.'^^xsd:string","","","",qudt:SpaceAndTimeQuantityKind|qudt:QuantityKind,'Area'^^xsd:string,"",|,
,"","","","","",qudt:SpaceAndTimeQuantityKind|qudt:QuantityKind,'Area Angle'^^xsd:string,"",,
,"","","",||,"",qudt:MechanicsQuantityKind|qudt:QuantityKind,'Area per Time'^^xsd:string,"",,
,"","","","","",qudt:QuantityKind|qudt:ThermodynamicsQuantityKind,'Area Temperature'^^xsd: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]'^^xsd:string","","","",qudt:QuantityKind|qudt:ThermodynamicsQuantityKind,'Area Thermal Expansion'^^xsd:string,"",,
,"","","","","",qudt:SpaceAndTimeQuantityKind|qudt:QuantityKind,'Area Time'^^xsd:string,"",,
,"","","","","",qudt:QuantityKind|qudt:ThermodynamicsQuantityKind,'Area Time Temperature'^^xsd:string,"",,
,"","'An Asset is an economic resource owned by a business or company. Simply stated, assets are things of value that can be readily converted into cash (although cash itself is also considered an asset).'^^xsd:string","",,"",qudt:QuantityKind|qudt:FinancialQuantityKind,'Asset'^^xsd:string,"",,
,"","'The pressure exerted at a point due to the presence of an atmosphere. In most circumstances atmospheric pressure is closely approximated by the hydrostatic pressure caused by the weight of air above the measurement point. Low pressure areas have less atmospheric mass above their location, whereas high pressure areas have more atmospheric mass above their location. Similarly, as elevation increases there is less overlying atmospheric mass, so that pressure decreases with increasing elevation. [Wikipedia]'^^xsd:string",,"","",qudt:QuantityKind|qudt:FluidMechanicsQuantityKind,'Atmospheric Pressure'^^xsd:string,"",|,""
,"","","","","",qudt:QuantityKind|qudt:AtomicPhysicsQuantityKind,'Atomic Charge'^^xsd:string,"",,
,'H'^^xsd: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.'^^xsd:string",,"","",qudt:QuantityKind|qudt:ElectricityAndMagnetismQuantityKind,'Auxillary Magnetic Field'^^xsd: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.'^^xsd:string,"","","",qudt:QuantityKind|qudt:ElectricityAndMagnetismQuantityKind,'Capacitance'^^xsd:string,"",|,
,"","'In computer operations, (a) the largest quantity which can be stored, processed, or transferred; (b) the largest number of digits or characters which may regularly be processed; (c) the upper and lower limits of the quantities which may be processed.
In other contexts, the amount of material that can be stored, such as fuel or food.'^^xsd:string","","",'TBD'^^xsd:string,qudt:QuantityKind|qudt:InformationQuantityKind,'Capacity'^^xsd:string,"",|,
,"","","","","",qudt:ChemistryQuantityKind|qudt:QuantityKind,'Catalytic Activity'^^xsd:string,"",|,
,"","'In fluid dynamics, circulation is the line integral around a closed curve of the fluid velocity. It has dimensions of length squared over time.'^^xsd:string",,"",'Γ'^^xsd:string,qudt:QuantityKind|qudt:FluidMechanicsQuantityKind,'Circulation'^^xsd:string,"",|,""
,"","","","","",qudt:QuantityKind|qudt:ThermodynamicsQuantityKind,'Coefficient of Heat Transfer'^^xsd: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.'^^xsd:string",,"",'Z'^^xsd:string,qudt:QuantityKind|qudt:ThermodynamicsQuantityKind,'Compressibility Factor'^^xsd:string,"",,""
,"","","",|,"",qudt:ChemistryQuantityKind|qudt:QuantityKind,'Concentration'^^xsd:string,"",|,
,"","","","","",qudt:QuantityKind|qudt:ElectricityAndMagnetismQuantityKind,'Cubic Electric Dipole Moment per Square Energy'^^xsd:string,"",,
,"","",,"","",qudt:QuantityKind|qudt:FinancialQuantityKind,'Currency'^^xsd: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]'^^xsd:string","","","",qudt:SpaceAndTimeQuantityKind|qudt:QuantityKind,'Curvature'^^xsd:string,"",|,
,"","'The frequency derived from the period of time required to transmit one bit. This represents the amount of data transferred per second by a communications channel or a computing or storage device. Data rate is measured in units of bits per second (written ""b/s"" or ""bps""), bytes per second (Bps), or baud. When applied to data rate, the multiplier prefixes ""kilo-"", ""mega-"", ""giga-"", etc. (and their abbreviations, ""k"", ""M"", ""G"", etc.) always denote powers of 1000. For example, 64 kbps is 64,000 bits per second. This contrasts with units of storage which use different prefixes to denote multiplication by powers of 1024, e.g. 1 kibibit = 1024 bits.'^^xsd:string","","","",qudt:QuantityKind|qudt:InformationQuantityKind,'Data Rate'^^xsd:string,"",|,
,"","","",,"",qudt:MechanicsQuantityKind|qudt:QuantityKind,'Density'^^xsd:string,"",|,
,"","","",|,'U'^^xsd:string,qudt:QuantityKind,'Dimensionless'^^xsd:string,"",|,
,"","",,|||||||,'ψ'^^xsd:string,qudt:QuantityKind,'Dimensionless Ratio'^^xsd: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.'^^xsd:string",,"","",qudt:QuantityKind|qudt:RadiologyQuantityKind,'Dose Equivalent'^^xsd:string,"",|,""
,"","",,"","",qudt:SpaceAndTimeQuantityKind|qudt:QuantityKind,'Dry Volume'^^xsd:string,"",,""
,"","'Dynamic Pressure (indicated with q, or Q, and sometimes called velocity pressure) is the quantity defined by:
q = 1/2 * ρv^2
where (using SI units):
q = dynamic pressure in pascals
ρ = fluid density in kg/m3 (e.g. density of air)
v = fluid velocity in m/s'^^xsd:string",,"",'q'^^xsd:string,qudt:QuantityKind|qudt:FluidMechanicsQuantityKind,'Dynamic Pressure'^^xsd:string,"",|,""
,"","",,"",'μ'^^xsd:string,qudt:QuantityKind|qudt:FluidMechanicsQuantityKind,'Dynamic Viscosity'^^xsd: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.'^^xsd:string","","",'Q'^^xsd:string,qudt:QuantityKind|qudt:ElectricityAndMagnetismQuantityKind,'Electric Charge'^^xsd:string,"",|,
,"","","","","",qudt:QuantityKind|qudt:ElectricityAndMagnetismQuantityKind,'Electric Charge Line Density'^^xsd:string,"",,
,"","","","","",qudt:ChemistryQuantityKind|qudt:QuantityKind|qudt:ElectricityAndMagnetismQuantityKind,'Electric Charge per Amount of Substance'^^xsd:string,"",,
,"","","",|,"",qudt:QuantityKind|qudt:ElectricityAndMagnetismQuantityKind,'Electric Charge per Unit Area'^^xsd:string,"",,
,"","","",|,"",qudt:QuantityKind|qudt:ElectricityAndMagnetismQuantityKind,'Electric Charge per Mass'^^xsd:string,"",,
,"","","","",'ρ'^^xsd:string,qudt:QuantityKind|qudt:ElectricityAndMagnetismQuantityKind,'Electric Charge Volume Density'^^xsd: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.'^^xsd:string","","",'σ'^^xsd:string,qudt:QuantityKind|qudt:ElectricityAndMagnetismQuantityKind,'Electric Conductivity'^^xsd: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.'^^xsd:string","","",'I'^^xsd:string,qudt:QuantityKind|qudt:ElectricityAndMagnetismQuantityKind,'Electric Current'^^xsd:string,"",|,
,'J'^^xsd: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.'^^xsd:string,"","",'J'^^xsd:string,qudt:QuantityKind|qudt:ElectricityAndMagnetismQuantityKind,'Electric Current Density'^^xsd:string,"",|,
,"","","","","",qudt:QuantityKind|qudt:ElectricityAndMagnetismQuantityKind,'Electric Current per Angle'^^xsd:string,"",,
,"","","","","",qudt:QuantityKind|qudt:ElectricityAndMagnetismQuantityKind,'Electric Current per Unit Energy'^^xsd:string,"",,
,"","","",|,"",qudt:QuantityKind|qudt:ElectricityAndMagnetismQuantityKind,'Electric Current per Unit Length'^^xsd: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.'^^xsd:string","","","",qudt:QuantityKind|qudt:ElectricityAndMagnetismQuantityKind,'Electric Dipole Moment'^^xsd:string,,,
,'D'^^xsd: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. '^^xsd:string",,"",'D'^^xsd:string,qudt:QuantityKind|qudt:ElectricityAndMagnetismQuantityKind,'Electric Displacement Field'^^xsd:string,"",,""
,'E'^^xsd: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)'^^xsd:string","",,"",qudt:QuantityKind|qudt:ElectricityAndMagnetismQuantityKind,'Electric Field'^^xsd: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.'^^xsd:string,"","","",qudt:QuantityKind|qudt:ElectricityAndMagnetismQuantityKind,'Electric Flux'^^xsd: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.'^^xsd:string",,"",'Φ'^^xsd:string,qudt:QuantityKind|qudt:ElectricityAndMagnetismQuantityKind,'Electric Potential'^^xsd:string,,,""
,"","'Electric power is the rate at which electrical energy is transferred by an electric circuit. In the simple case of direct current circuits, electric power can be calculated as the product of the potential difference in the circuit (V) and the amount of current flowing in the circuit (I):
P = VI
where
P is the power
V is the potential difference
I is the current.
However, in general electric power is calculated by taking the integral of the vector cross-product of the electrical and magnetic fields over a specified area.'^^xsd:string",,"","",qudt:QuantityKind|qudt:ElectricityAndMagnetismQuantityKind,'Electric Power'^^xsd: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.'^^xsd:string","","",'Q'^^xsd:string,qudt:QuantityKind|qudt:ElectricityAndMagnetismQuantityKind,'Electric Quadrupole Moment'^^xsd:string,,,
,"","'In physics, electromotive force, or most commonly emf (seldom capitalized), or (occasionally) electromotance is ""that which tends to cause current (actual electrons and ions) to flow.""[1]. More formally, emf is the external work expended per unit of charge to produce an electric potential difference across two open-circuited terminals.[2][3] The electric potential difference is created by separating positive and negative charges, thereby generating an electric field.[4][5] The created electrical potential difference drives current flow if a circuit is attached to the source of emf. When current flows, however, the voltage across the terminals of the source of emf is no longer the open-circuit value, due to voltage drops inside the device due to its internal resistance. [Wikipedia]'^^xsd:string",,"",'ℰ'^^xsd:string,qudt:QuantityKind|qudt:ElectricityAndMagnetismQuantityKind,'Electromotive Force'^^xsd:string,"",|,""
,"","","",