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The kilogram (kg) is the unit of mass (m). The name is derived from the Greek words kilo (κιλό), meaning "thousand", and gramma (γράμμα), known in the Late Antiquity as 1/24 part of a Roman uncia or about 1.14 gram.

The kilogram is defined in terms of second and meter, based on fixed fundamental constants of nature.

Related units:

Last modified:15 January 2021 9.03 p.m.
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