Physical quantity
A physical quantity is a property of a phenomenon, body, or substance, where the property has a magnitude that can be expressed as a number and a "reference". The "reference" will often be a measurement unit, but not always (as in the cases of ordinal quantities and quantities of dimension one).[1] Examples of physical quantities include length, energy and electronegativity.
Physical quantities can be grouped together as quantities of the same kind: for example, radius and wavelength are usually considered to quantities of the same kind, length.[1] Quantities of the same kind will always have the same dimensions, but not all quantities with the same dimensions are of the same kind, and not all physical quantities have dimensions at all.[1]
Many important physical quantities, along with the quantity equations that relate them, form part of the International System of Quantities.
References
- ↑ 1.0 1.1 1.2 International vocabulary of metrology — Basic and general concepts and associated terms (VIM), 3rd ed.; International Bureau of Weights and Measures: Sèvres, France, 2008; pp 2–16, <http://www.bipm.org/utils/common/documents/jcgm/JCGM_200_2008.pdf>.
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