::Physical quantity


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A physical quantity (or "physical magnitude") is a physical property of a phenomenon, body, or substance, that can be quantified by measurement.<ref>Joint Committee for Guides in Metrology (JCGM), International Vocabulary of Metrology, Basic and General Concepts and Associated Terms (VIM), III ed., Pavillon de Breteuil : JCGM 200:2012 (on-line)</ref> A physical quantity can be expressed as the combination of a number – usually a real number – and a unit or combination of units; for example, {{safesubst:#invoke:val|main}} (the mass of the neutron), or {{safesubst:#invoke:val|main}} (the speed of light).

Physical quantity sections
Intro  Symbols, nomenclature  Units and dimensions  Base quantities  General derived quantities  See also  References  Sources  

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