Femto-
Femto- (symbol f) is a unit prefix in the metric system denoting a factor of 10−15 or 0.000000000000001. Adopted by the 11th General Conference on Weights and Measures,[1] it was added in 1964 to the SI.[2] It is derived from the Danish word femten, meaning "fifteen".
Examples of use:
- The HIV-1 virus has the mass of about 1 x 10−15 g or 1 fg. Orders of magnitude (mass)
- a proton has a diameter of about 1.6 to 1.7 femtometres.
- More examples available.
The femtometre shares the unit symbol (fm) with the older non-SI unit fermi, to which it is equivalent. The fermi, named in honour of Enrico Fermi, is often encountered in nuclear physics.
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- ↑ Prefixes adopted before 1960 already existed before SI. 1873 was the introduction of the CGS system.
References
- ↑ International Bureau of Weights and Measures (2006), The International System of Units (SI) (PDF) (8th ed.), ISBN 92-822-2213-6, archived (PDF) from the original on 2017-08-14
- ↑ BIPM - Resolution 8 of the 12th CGPM
Character from Berserk
External links
Look up femto- in Wiktionary, the free dictionary. |
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