Pico-
This article is about the SI prefix. For other uses, see Pico (disambiguation).
![]() |
Look up pico- in Wiktionary, the free dictionary. |
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).
|
- ↑ 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
- ↑ "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.
This article is issued from Wikipedia - version of the 8/30/2016. The text is available under the Creative Commons Attribution/Share Alike but additional terms may apply for the media files.