What is the origin, the symbol, and the factor of the femto- prefix?
by 
Egao No Genki
ANSWERS: 1
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femto- is an SI prefix (symbol f) in the SI system of units denoting a factor of 10−15 or 0.000 000 000 000 001. Adopted in 1964 by the 12th Conférence Générale des Poids et Mesures [1], it comes from the Danish or Norwegian femten, Old Norse fimmtÄn, meaning fifteen. Examples: One femtosecond = 10^−15 s One femtojoule = 10^−15 J Note that the femtometre (10−15 of a metre) shares the same unit symbol (fm) with the older non-SI unit fermi, to which it is equivalent. The fermi, in honour of Enrico Fermi is often encountered in nuclear physics that is characteristic of this scale. 1000^−5 10^−15 femto Symbol:f Quadrillionth Billiardth 0.000 000 000 000 001
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