A kilogram is a unit of measurement in the metric system. It is equal to 1000 grams, or about 2.2 pounds. The kilogram is the only SI unit with a prefix, and it is also the only SI unit that is not derived from another SI unit. The symbol for a kilogram is “kg”.
The kilogram was first introduced in 1795, and it has been used as the basis for all other units of mass since then. In 1875, the International Bureau of Weights and Measures (IBWM or [in French BIPM (Bureau international des poids et measures)]) was established to maintain international standards for weights and measures, including the kilogram. The BIPM’s authority on weights and measures was ratified by an international agreement in 1879.
The modern definition of the kilogram was adopted by the General Conference on Weights and Measures (GCWM or [in French CGPM (Conférence générale des poids et measures)]) in 1889 as part of the International System of Units (SI). It replaced two earlier definitions: one from 1793 involving a prototype weight made out of platinum-iridium alloy kept at Sevres near Paris, and one from 1801 which used a similar but less precise standard known as “grave.”
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