Difference between revisions of "Physical quantity"
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| − | A '''physical quantity''' is a physical property of a phenomenon, body, or substance, that can be quantified by [[measurement]]. | + | A '''physical quantity''' is a physical property of a phenomenon, body, or substance, that can be [[Quantification (science)|quantified]] by [[measurement]]. |
== Description == | == Description == | ||
| − | A physical quantity can be expressed as the combination of a magnitude expressed by a [[number]] – usually a [[real number]] – and a [[ | + | A physical quantity can be expressed as the combination of a magnitude expressed by a [[number]] – usually a [[real number]] – and a [[Units of measurement|unit of measurement]]; for example, 1.6749275×10−27 kg (the mass of the neutron), or 299792458 metres per second (the speed of light). |
Physical quantities are measured as ''''nu'''' where '''n''' is the magnitude and '''u''' is the unit. | Physical quantities are measured as ''''nu'''' where '''n''' is the magnitude and '''u''' is the unit. | ||
Revision as of 06:27, 29 August 2016
A physical quantity is a physical property of a phenomenon, body, or substance, that can be quantified by measurement.
Description
A physical quantity can be expressed as the combination of a magnitude expressed by a number – usually a real number – and a unit of measurement; for example, 1.6749275×10−27 kg (the mass of the neutron), or 299792458 metres per second (the speed of light).
Physical quantities are measured as 'nu' where n is the magnitude and u is the unit.
For example: A boy measured the length of a room as 3 m. Here 3 is the magnitude and m (metre) is the unit. 3 m can also be written as 300 cm. This shows that n1u1 =n2u2.
Almost all matters have quantity.
See also
External links
- Physical quantity @ Wikipedia
[Category:Physics]]
