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Synonyms for kilogram

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The international prototype of the kilogram (IPK) is kept in a vault at the International Bureau of Weights and Measures (BIPM) located in Sevres, just outside of Paris, France, and is taken out only rarely for comparison with its official copies.
The kilogram, symbol kg, is the unit of mass; its magnitude is set by fixing the numerical value of the mass of the international prototype of the kilogram to be equal to exactly 1 when it is expressed in the SI unit kg.
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