Editing Metrology (section)

=== Realisation of units ===

[[File:CGKilogram.jpg|thumb|alt=Computer-generated image of a small cylinder|Computer-generated image realising the international prototype of the kilogram (IPK), made from an alloy of 90-per cent platinum and 10-per cent iridium by weight]]
The [[Realisation (metrology)|realisation]] of a unit of measure is its conversion into reality.<ref name=OED>{{OED|Realise}}</ref> Three possible methods of realisation are defined by the [[Joint Committee for Guides in Metrology#VIM: International vocabulary of metrology|international vocabulary of metrology]] (VIM): a physical realisation of the unit from its definition, a highly-reproducible measurement as a reproduction of the definition (such as the [[quantum Hall effect]] for the [[ohm]]), and the use of a material object as the measurement standard.<ref>{{cite book|title=International vocabulary of metrology—Basic and general concepts and associated terms (VIM)|date=2012|publisher=[[International Bureau of Weights and Measures]] on behalf of the Joint Committee for Guides in Metrology|page=46|edition=3rd|url=http://www.bipm.org/utils/common/documents/jcgm/JCGM_200_2012.pdf|access-date=1 March 2017|url-status=live|archive-url=https://web.archive.org/web/20170317223139/http://www.bipm.org/utils/common/documents/jcgm/JCGM_200_2012.pdf|archive-date=17 March 2017}}</ref>