Block Of Metal


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The kilogram or kilogramme (symbol: kg ) is the base unit of mass in the International System of Units (SI). Until 20 May 2019, it remains defined by a platinum alloy cylinder, the International Prototype Kilogram (informally Le Grand K or IPK), manufactured in 1889, and carefully stored in Saint-Cloud , a suburb of Paris . After 20 May, it will be defined in terms of fundamental physical constants .


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