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physical quantity |
A PhysicalQuantity is a measure of some quantifiable aspect of the modeled world, such as 'the earth's diameter' (a constant length) and 'the stress in a loaded deformable solid' (a measure of stress, which is a function of three spatial coordinates). Every PhysicalQuantity is either a ConstantQuantity or FunctionQuantity. Instances of ConstantQuantity are dependent on a UnitOfMeasure, while instances of FunctionQuantity are Functions that map instances of ConstantQuantity to other instances of ConstantQuantity (e.g., a TimeDependentQuantity is a FunctionQuantity). Although the name and definition of PhysicalQuantity is borrowed from physics, a PhysicalQuantity need not be material. Aside from the dimensions of length, time, velocity, etc., nonphysical dimensions such as currency are also possible. Accordingly, amounts of money would be instances of PhysicalQuantity. A PhysicalQuantity is distinguished from a pure Number by the fact that the former is associated with a dimension of measurement.
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area measure | Measures of the amount of space in two dimensions. |
| | composite unit of measure | Instances of this Class are UnitsOfMeasure defined by the functional composition of other units, each of which might be a CompositeUnitOfMeasure or a NonCompositeUnitOfMeasure. |
| | unary constant function quantity | A subclass of FunctionQuantity, instances of which are returned by UnaryFunctions that map from one instance of the Class ConstantQuantity to another instance of the Class ConstantQuantity. |
| | volume measure | Measures of the amount of space in three dimensions. |
| Instances | kilometer per hour | KiloMeterPerHour is a unit of speed, expressing the number of Kilometer travelled in one Hour.[Wikipedia]. |
| | meter per second | MeterPerSecond is the unit for of both speed and velocity in the International System of Units (SI), equal to the speed of a body covering a distance of one metre in a time of one second. [Wikipedia]. |
| | micrograms per kilogram | McgPerKg refers to a microgram of BiologicallyActiveSubstance per Kilogram of the body weight of the Organism taking the Substance. |
| | miles per hour | MilesPerHour is a unit for measuring speed, expressed in the number of Miles travelled in a one HourDuration. |
| | speed of light in vacuum | The speed of light in vacuum, often called simply the speed of light and commonly denoted c, is a universal physical constant exactly equal to 299792458 m⋅s−1. It is exact because, by international agreement, a metre is defined as the length of the path travelled by light in vacuum during a time interval of 1⁄299792458 second. The value 299,792,458 metres per second is approximately 1 billion kilometres per hour; 700 million miles per hour.[Wikipedia] |