A kilogram, often denoted by
kg, is one thousand
grams, and is one of seven
SI base units. It is a unit of
mass. The
SI system defines the unit to be equal to the mass of the international prototype of the kilogram, which is made from an alloy of
platinum and
iridium and kept at the Bureau International des Poids et Mesures ([International bureau of Weights and Measures]
?). Official copies of the prototype kilogram are made available as national prototypes. The international protoype kilogram was made in the
1880s.
The kilogram is intended to represent the mass of one liter of water.
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