Femto

For the manga character, see Berserk (manga).

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, it comes from the Danish or Norwegian femten, 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.

SI prefixes
10ⁿ	Prefix	Symbol	Short scale	Long scale	Decimal equivalent in SI#SI writing style > SI writing style
10²⁴	yotta	Y	Septillion	Quadrillion	1 000 000 000 000 000 000 000 000
10²¹	zetta	Z	Sextillion	Trilliard (thousand trillion)	1 000 000 000 000 000 000 000
10¹⁸	exa	E	Quintillion	Trillion	1 000 000 000 000 000 000
10¹⁵	peta	P	Quadrillion	Billiard (thousand billion)	1 000 000 000 000 000
10¹²	tera	T	Trillion	Billion	1 000 000 000 000
10⁹	giga	G	Billion	Milliard (thousand million)	1 000 000 000
10⁶	mega	M	Million		1 000 000
10³	kilo	k	Thousand		1 000
10²	hecto	h	Hundred		100
10¹	deca, deka	da	Ten		10
10⁰	(none)	(none)	One		1
10⁻¹	deci	d	Tenth		0.1
10⁻²	centi	c	Hundredth		0.01
10⁻³	milli	m	Thousandth		0.001
10⁻⁶	micro	µ (u)	Millionth		0.000 001
10⁻⁹	nano	n	Billionth	Milliardth	0.000 000 001
10⁻¹²	pico	p	Trillionth	Billionth	0.000 000 000 001
10⁻¹⁵	femto	f	Quadrillionth	Billiardth	0.000 000 000 000 001
10⁻¹⁸	atto	a	Quintillionth	Trillionth	0.000 000 000 000 000 001
10⁻²¹	zepto	z	Sextillionth	Trilliardth	0.000 000 000 000 000 000 001
10⁻²⁴	yocto	y	Septillionth	Quadrillionth	0.000 000 000 000 000 000 000 001

External links

[Bureau International des Poids et Mesures (BIPM)]

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