fermi; femtometer
A unit of length equal to 10⁻¹⁵ meters, used in nuclear and particle physics. Named after Enrico Fermi.
See also: フェムトメートル
The radius of an atomic nucleus is on the order of a few fermis.
One fermi is equal to 10 to the power of minus 15 meters.
Fermi degeneracy; degenerate fermions; Fermi gas; degenerate matter
From Italian 'Fermi', after physicist Enrico Fermi. The unit name was adopted internationally and borrowed into Japanese as フェルミ.