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Entity > Abstract > Quantity > PhysicalQuantity > ConstantQuantity > VolumeMeasure > UnitedStatesGallon
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UnitedStatesGallon comparison table
Subject be first domain of be second domain of documentation have axiom is a kind of is an instance of have relatedInternalConcept
UnitOfMeasureSubtractionFnMeasureFnA standard of measurement for some dimension. For example, the Meter is a UnitOfMeasure for the dimension of length, as is the Inch. There is no intrisic property of a UnitOfMeasure that makes it primitive or fundamental; rather, a system-of-units (e.g. SystemeInternationalUnit) defines a set of orthogonal dimensions and assigns units for each
(=>
    (and
       (instance ?REL RelationExtendedToQuantities)
       (instance ?REL BinaryRelation)
       (instance ?NUMBER1 RealNumber)
       (instance ?NUMBER2 RealNumber)
       (holds ?REL ?NUMBER1 ?NUMBER2))
    (forall (?UNIT)
       (=>
          (instance ?UNIT UnitOfMeasure)
          (holds ?REL (MeasureFn ?NUMBER1 ?UNIT) (MeasureFn ?NUMBER2 ?UNIT)))))
PhysicalQuantity  
VolumeMeasureMagnitudeFnDensityFnMeasures of the amount of space in three dimensions
(=>
    (instance ?FUNCTION UnaryConstantFunctionQuantity)
    (and
       (domain ?FUNCTION 1 ConstantQuantity)
       (range ?FUNCTION ConstantQuantity)))
ConstantQuantity  
UnitedStatesGallonMagnitudeFnDensityFnUnit of volume commonly used in the United States
(equal
         (MeasureFn ?NUMBER UnitedStatesGallon)
         (MeasureFn (MultiplicationFn ?NUMBER 3.785411784) Liter))
 VolumeMeasureUnitedKingdomGallon

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