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Wikipedia: Kilogram
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A Kilogram, often denoted by Kg, is one thousand grams?, and is one of seven SI base units. It is the unit of mass and is equal to the mass of the international prototype of the kilogram, which is made from a mixture of platinum and rhodium.
Originally, the gram was defined as the mass of one cubic centimetre of water (used because liquid water does not expand or contract much as its temperature changes).