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This article is about the SI prefix. For the manga character, see Griffith (Berserk).

Femto- (symbol f) is a unit prefix in the metric system denoting a factor of 10−15 or Script error: No such module "Gaps".. 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".

Example of use:

  • a proton has a diameter of about 1.6 to 1.7 femtometres.

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.

Template:Metric prefixes


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