Physical quantity

Ampèremetre (Ammeter)

A physical quantity (or simply quantity)[1][a] is a property of a material or system that can be quantified by measurement. A physical quantity can be expressed as a value, which is the algebraic multiplication of a numerical value and a unit of measurement. For example, the physical quantity mass, symbol m, can be quantified as m=n kg, where n is the numerical value and kg is the unit symbol (for kilogram). Quantities that are vectors have, besides numerical value and unit, direction or orientation in space.

  1. ^ a b Cite error: The named reference ISO 80000-1 was invoked but never defined (see the help page).


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