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Metric system
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===Mass=== A [[1 euro coin|1-euro coin]] weighs 7.5 g;<ref>{{cite web |title=RUBINGHSCIENCE.ORG / Using Euro coins as weights |url=http://www.rubinghscience.org/surv/euroweights1.html |access-date=22 October 2019 |website=www.rubinghscience.org}}</ref> a [[Sacagawea dollar|Sacagawea US 1-dollar coin]] weighs 8.1 g;<ref>{{cite web |date=20 September 2016 |title=Coin Specifications {{!}} U.S. Mint |url=https://www.usmint.gov/learn/coin-and-medal-programs/coin-specifications |access-date=22 October 2019 |website=www.usmint.gov}}</ref> a [[Fifty pence (British coin)|UK 50-pence coin]] weighs 8.0 g.<ref>{{cite web |title=Fifty Pence Coin |url=https://www.royalmint.com/discover/uk-coins/coin-design-and-specifications/fifty-pence-coin/ |access-date=22 October 2019 |website=www.royalmint.com}}</ref>
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