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# 瞶秖 (PhysicalQuantity)

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). All PhysicalQuantities are either ConstantQuantities or FunctionQuantities. 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., TimeDependentQuantities are FunctionQuantities). Although the name and definition of PhysicalQuantity is borrowed from physics, PhysicalQuantities 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. PhysicalQuantities are distinguished from Numbers by the fact that the former are associated with a dimension of measurement.

## Ontology

SUMO / BASE-ONTOLOGY

 龟砰

┾禜

计秖

瞶秖

## Related WordNet synsets

measure, quantity, amount, quantum
how much there is of something that you can measure

scale value
a value on some scale of measurement

See more related synsets on a separate page.

## Axioms (1)

瞶秖 Ч だ澄Θ 盽秖,ㄧ计秖.
`(partition PhysicalQuantity ConstantQuantity FunctionQuantity)`