Deci-
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Deci- (symbol d) is a decimal unit prefix in the metric system denoting a factor of one tenth. Proposed in 1793[1] and adopted in 1795, the prefix comes from the Latin decimus, meaning "tenth". Since 1960, the prefix is part of the International System of Units (SI). Its most frequent use, however, is in a non-SI unit, the decibel, used to measure sound intensity (relative to a reference) and many other ratios.
Example:
- A compact disc is about 12 centimeters or 1.2 decimeters.[2]
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- ↑ The metric system was introduced in 1795 with several metric prefixes, of which, however, only six were adopted as SI prefixes by the 11th CGPM conference in 1960, whereas myria (104) as well as double and demi were not adopted. In 1873, micro and mega were recommended by the British Association for the Advancement of Science. The other dates relate to recognition by a resolution of the CGPM.
References
- ↑ Commission temporaire de Poids & Mesures rêpublicaines, En exécution des Décrets de la Convention Nationale (1793). Instruction abrégée sur les mesures déduites de la grandeur de la Terre; uniformes pour toute la Rêpublique, et sur les Calculs relatifs à leur division décimale (in French) (Edition originale ed.). Paris, France: De l´imprimerie nationale exécutive du Louvre. Retrieved 2015-10-09.
- ↑ http://www.nikon.com/about/feelnikon/universcale/index_f.htm
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