Realization
In metrology, the realization of a measurement unit or a measurement scale is the practical method by which the unit can be measured (or the scale put into practice). The realization of a unit or of a scale creates one or more measurement standards against which an unknown physical quantity of the same kind can be compared.[1]
There are three general methods of realizing a unit or a scale. The first and most obvious is simply to follow the definition of the unit or scale, for example by measuring the distance travelled by light in vacuum in 1⁄299,792,458 of a second to realize the metre. The second method is to use a physical phenomenon which is accepted to be equivalent to the definition, for example realizing the metre by laser interferometry with a measured frequency of light. The third method is to have a physical standard, for example the now-obsolete International Prototype Metre.[1]
References
- ↑ 1.0 1.1 International vocabulary of metrology — Basic and general concepts and associated terms (VIM), 3rd ed.; International Bureau of Weights and Measures: Sèvres, France, 2008; pp 46–47, <http://www.bipm.org/utils/common/documents/jcgm/JCGM_200_2008.pdf>.
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