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# QuantitáCostante (ConstantQuantity)

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).

## Ontology

SUMO / BASE-ONTOLOGY

## Superclass(es)

 Entitá

Astratto

Quantitá

QuantitáFisica

QuantitáCostante

## Coordinate term(s)

FunzioneDiQuantitá  UnitáDiMisura

## Constrains relations

interval fn  magnitude fn  measure fn

## Related WordNet synsets

See more related synsets on a separate page.

## Axioms (2)

QuantitáFisica é esaustivamente partizionato in QuantitáCostante,FunzioneDiQuantitá.
`(partition PhysicalQuantity ConstantQuantity FunctionQuantity)`

Se function é un' istanza di FunzioneDiQuantitáUnariaECostante, allora il numero argomenti di function é un istanza di QuantitáCostante e rango di function é un'istanza di QuantitáCostante.
```(=>
(instance ?FUNCTION UnaryConstantFunctionQuantity)
(and
(domain ?FUNCTION 1 ConstantQuantity)
(range ?FUNCTION ConstantQuantity)))```