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by Running, Fall Up on July 29th, 2005

Running, Fall Up

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What is the origin, the symbol, and the factor of the femto- prefix?

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  • by Anonymous on April 18th, 2007

    Anonymous

    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 fimmtān, 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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