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What is the International Prototype Kilogram?

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... kilogram abbr. kg, fundamental unit of mass in the metric system , defined as the mass of the International Prototype Kilogram, a platinum-iridium cylinder kept at Sèvres, France, near Paris ...

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Similar questions: What is the purpose of the International Prototype Kilogram? What is the name of the platinum-iridium cylinder that defines a kilogram? [ Hide these questions ]

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