Question

fermi is the si unit of what ?​

Answer 1

The femtometre (American spelling femtometer, symbol fm derived from the Danish and Norwegian word femten, "fifteen" (15), Ancient Greek: μέτρον, metrοn, "unit of measurement") is an SI unit of length equal to 10−15 metres, which means a quadrillionth of one.

Answer 2

Explanation:

A unit of length used to measure nuclear distances, = 10⁻¹⁵ meter. Named for the Italian physicist Enrico Fermi (1901–1954). Now obsolete, replaced by the SI term femtometer (symbol, fm); one fermi = one femtometer.