# Physical quantity

## Measurable property of a material or system / From Wikipedia, the free encyclopedia

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A **physical quantity** (or simply **quantity**)^{[1]}^{[lower-alpha 1]} 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.

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