Pico-
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Pico- (symbol p) is a unit prefix in the metric system denoting one trillionth, a factor of 10−12 (0.000000000001).
Derived from the Spanish pico, meaning peak, beak, bit,[1] this was one of the original 12 prefixes defined in 1960 when the International System of Units was established.[2]
The radius of atoms range from 25 picometers (hydrogen) to 260 picometers (caesium). One picolight-year is about nine kilometers (six miles).
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- ↑ Prefixes adopted before 1960 already existed before SI. 1873 was the introduction of the CGS system.
See also
References
- ↑ "pico- - definition of pico- by the Free Online Dictionary, Thesaurus and Encyclopedia". Retrieved 2013-06-25.
- ↑ "Resolution 12 of the 11th CGPM". Bureau International des Poids et Mesures. 1961. Retrieved 2007-03-29.
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