Physical quantity

Summary

A physical quantity (or simply quantity) 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). Components Following ISO 80000-1, any value or magnitude of a physical quantity is expressed as a comparison to a unit of that quantity. The value of a physical quantity Z is expressed as the product of a numerical value {Z} and a unit [Z]: :Z = {Z} \times [Z]. For example, let Z be "2 metres"; then, {Z} = 2 is the numerical value and [Z] = \mathrm{metre} is the unit. Conversely, the numerical value expressed in an arbitrary unit can be obtained as: :{Z} = Z / [Z]. The

Official source

https://en.wikipedia.org/wiki/Physical_quantity

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2011