femto- [FEM toh]
(Danish and Norwegian: fifteen; a decimal prefix used in the international metric system for measurements)
It is used in the metric [decimal] system as quadrillionth [U.S.] and thousand-billionth part [U.K.], 10-15 [0.000 000 000 000 001]. The metric symbol for femto- is f.
femtoampere
femtogram
femtojoule
femtoliter
femtometer
femtomole
femtosecond
A femtosecond is one millionth of a nanosecond or 10-15 of a second and is a measurement sometimes used in laser technology.
femtovolt
femtowatt (fW)
The quadrillionth [U.S.] and thousand-billionth part [U.K.], 10-15 [0.000 000 000 000 001] of a watt.
Related "metric" families:
yotta;
zetta;
exa;
peta;
tera;
giga;
mega;
kilo;
hecto;
deka;
deci;
centi;
milli;
micro;
nano;
pico;
atto;
zepto;
yocto.
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