Other Definitions
femtometre (dict)
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FemtometreFemtometre (American spelling: femtometer, symbol:fm) is an SI measure of length that is equal to 10−15 (femto) of a metre. It is commonly used in measuring the diameter of atomic nuclei. The diameter of an atomic nucleus is up to about 15 fm. Neutrons and protons are about 1 fm in diameter. In the parlance of particle physicists, a femtometre is often called a fermi (same symbol), after the physicist Enrico Fermi. attometre << femtometre << picometre See also
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