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S.I.

The International System of Units, internationally known by the abbreviation SI (for Système International),: 125 : iii  is the modern form: 117  of the metric system and the world's most widely used system of measurement.: 123  Established and maintained by the General Conference on Weights and Measures (CGPM), it is the only system of measurement with an official status in nearly every country in the world, employed in science, technology, industry, and everyday commerce. 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 c… more »