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Metric system
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==Adoption== [[File:Metric and imperial systems (2019).svg|thumb|400x400px|Units in everyday use by country as of 2019]] The SI system has been adopted as the official system of weights and measures by most countries in the world. A notable outlier is the [[United States]] (US). Although used in some contexts, the US has resisted full adoption; continuing to use [[Imperial and US customary measurement systems|different measurement systems]]".<ref>{{cite book |last=Gullberg |first=Jan |author-link=Jan Gullberg |title=Mathematics from the Birth of Numbers |publisher=W. W. Norton and Company |location=New York and London |year=1997 |isbn=978-0-393-04002-9 |page=52 |chapter=2.4 Decimal Position System}}</ref> Adopting the metric system is known as [[metrication]].
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