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 ConstantQuantity documentation A ConstantQuantity is a PhysicalQuantity which has a constant value, e.g. 3 meters and 5 hours. The magnitude (see MagnitudeFn) of every ConstantQuantity is a RealNumber. ConstantQuantities are distinguished from FunctionQuantities, which map ConstantQuantities to other ConstantQuantities. All ConstantQuantites are expressed with the BinaryFunction MeasureFn, which takes a Number and a UnitOfMeasure as arguments. For example, 3 Meters can be expressed as (MeasureFn 3 Meter). ConstantQuantities form a partial order (see PartialOrderingRelation) with the lessThan relation, since lessThan is a RelationExtendedToQuantities and lessThan is defined over the RealNumbers. The lessThan relation is not a total order (see TotalOrderingRelation) over the class ConstantQuantity since elements of some subclasses of ConstantQuantity (such as length quantities) are incomparable to elements of other subclasses of ConstantQuantity (such as mass quantities) has axiom `(=> (instance ?FUNCTION UnaryConstantFunctionQuantity) (and (domain ?FUNCTION 1 ConstantQuantity) (range ?FUNCTION ConstantQuantity)))` is first domain of MagnitudeFn is second domain of measure is a kind of PhysicalQuantity PhysicalQuantity is partitioned into ConstantQuantity, FunctionQuantity Abstract is disjoint from Physical Kinds of ConstantQuantity :

• AmountOfSubstanceMeasure (1 kind, 4 facts)
• CurrencyMeasure (2 kinds, 10 facts)
• InformationMeasure (4 kinds, 19 facts)
• LengthMeasure (7 kinds, 38 facts) - The Class of ConstantQuantities relating to length
• MassMeasure (6 kinds, 30 facts) - The Class of ConstantQuantities relating to the amount of matter in an Object
• PlaneAngleMeasure (2 kinds, 12 facts)
• SolidAngleMeasure (1 kind, 4 facts)
• ThermodynamicTemperatureMeasure (3 kinds, 15 facts) - Measures of temperature. In scientific circles, the temperature of something is understood as the average velocity of the atoms or molecules that make up the thing
• TimeMeasure (20 kinds, 159 facts) - The class of temporal durations (instances of TimeDuration) and positions of TimePoints and TimeIntervals along the universal timeline (instances of TimePosition)
• VolumeMeasure (7 kinds, 37 facts) - Measures of the amount of space in three dimensions