International System of Units

Modern form of the metric system

The International System of Units, internationally known by the abbreviation SI (from its official French name, Système international d'unités), is the modern form of the metric system and the world's most widely used system of measurement. It is the only system of measurement with official status in nearly every country in the world, employed in science, technology, industry, and everyday commerce. The International Bureau of Weights and Measures (abbreviated BIPM from French: Bureau international des poids et mesures) coordinates the SI. The SI comprises a coherent system of units of measurement starting with seven base units, which are the second (symbol: s, the unit of time), metre (m, length), kilogram (kg, mass), ampere (A, electric current), kelvin (K, thermodynamic temperature), mole (mol, amount of substance), and candela (cd, luminous intensity).

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