The 'fermi' is a non-
SI unit of
length that is internationally recognised and equivalent to the SI-recognised
femtometre. The symbol for both the fermi and the femtometre is 'fm'. The unit was named in honour of
Enrico Fermi and is often encountered in
nuclear physics as a characteristic of this scale.
Definition
: 1 fermi = 1.0 x 10
–15 metres = 1 femtometre = 0.001 picometre = 1000 attometres
For an example of lengths in this unit, the
radius of a
gold nucleus is approximately 8.45 fermis.
History
The fermi is named after the
Italian physicist Enrico Fermi (1901–1954), one of the founders of nuclear physics. The term was coined by
Robert Hofstadter in an 1956 paper published in the
Reviews of Modern Physics journal. The term is widely used by nuclear and
particle physicists.
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