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The International System of Units, abbreviated SI (for the french name Système International d'Unités), is the most widely used system of units in science, and the legal system in most countries. It was adopted by the 11th General Conference on Weights and Measures (CGPM) in 1960 and is built on the seven SI base units, which are used to define various SI derived units.

Americans frequently spell 'metre' as 'meter', and 'litre' as 'liter'; however 'metre' and 'litre' are the official BIPM names for these units, although the American usage has been approved by the US government. The official US spelling for 'deca' is 'deka', though Americans use the international spelling more often than the American one. The unit 'gram' is also sometimes spelt 'gramme', though that is an older spelling.

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The reference for "Quantities, Units and Symbols in Physical Chemistry" is ISBN:0632035838.

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Also, Sports Illustrated.