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Encyclopedia :
F :
FE :
FEM :
Femto |
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FemtoFemto is a prefix (see all prefixes) to a unit and means that it is 10-15 times this unit, or, one quindecillionth (European) or one quadrillionth (American). Examples are one femtosecond or one femtometre.Adopted in 1964, it comes from the Danish or Norwegian femten, meaning fifteen.
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