Kilogram
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The kilogram is the SI unit of mass. Earlier definitions of units of mass in the metric system started with the gram, which is one-thousandth of a kilogram. The first definition of a gram was the weight of 1 cm3 of water at its maximum density (at 4 degrees C); the kilogram was the weight of 1,000 cm3, or 1 dm3 of water. Since then, the kilogram has been defined by the weight of a prototype cylinder kept at Sevres, France.