International system of units

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International System of Units

(Abbreviated SI in all languages.) A system of physical units in which the fundamental quantities are length, time, mass, electric current, temperature, luminous intensity, and amount of substance, and the corresponding units are the meter, second, kilogram, ampere, kelvin, candela, and mole.

It has been given official status and recommended for universal use by the General Conference on Weights and Measures. It is also known (in French) as Système International d'Unités.