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The Convention du Mètre of May 20, 1875 is an international treaty that established three organizations to oversee the keeping of metric standards. It is written in French, and called in English the Metre Convention, or, in the United States, the Meter Convention or Treaty of the Meter. It was revised at the 6th CGPM in 1921. In 1960, the system of units it established was renamed the Système international d'unités (SI) ("International System of Units"). The Convention created three main organizations:
Signatories There were originally 17 signatories to the treaty. This number grew to 21 in 1900, 32 in 1950, 44 by 1975, 48 by 1997, and 49 by 2001. As of 2005, there are 51 signatories (with year of accession in parentheses): Several other states have associate status: See also ISO 8601 defines 1875 as the year the Convention du Mètre was signed, by way of a reference date. | ||||||||
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