<Table> <Tr> <Td> </Td> <Td> The neutrality of this article is disputed . Relevant discussion may be found on the talk page . Please do not remove this message until conditions to do so are met . (March 2018) (Learn how and when to remove this template message) </Td> </Tr> </Table> <Tr> <Td> </Td> <Td> The neutrality of this article is disputed . Relevant discussion may be found on the talk page . Please do not remove this message until conditions to do so are met . (March 2018) (Learn how and when to remove this template message) </Td> </Tr> <P> A physical quantity is a physical property of a phenomenon, body, or substance, that can be quantified by measurement or we can say that quantities which we come across during our scientific studies are called as the physical quantities . A physical quantity can be expressed as the combination of a magnitude expressed by a number--usually a real number--and a unit: n u (\ textstyle nu) where n (\ textstyle n) is the magnitude and u (\ textstyle u) is the unit . For example, 6973167492749999999 ♠ 1.674 9275 × 10 kg (the mass of the neutron), or 7008299792458000000 ♠ 299 792 458 metres per second (the speed of light). The same physical quantity x (\ textstyle x) can be represented equivalently in many unit systems, i.e. x = n 1 u 1 = n 2 u 2 (\ textstyle x = n_ (1) u_ (1) = n_ (2) u_ (2)). </P> <P> Symbols for quantities should be chosen according to the international recommendations of ISO / IEC 80000, the IUPAP red book and the IUPAC green book . For example, the recommended symbol for the physical quantity mass is m, and the recommended symbol for the quantity charge is Q . </P>

Numerical value of magnitude of a physical quantity is