Femto-

Femto- (symbol f) is a unit prefix in the metric system denoting a factor of 10−15 or 0.000000000000001. Adopted by the 11th General Conference on Weights and Measures, [1] it was added in 1964 to the SI. [2] It is derived from the Danish word femten, meaning "fifteen".

Examples of use:

The femtometre shares the unit symbol (fm) with the older non-SI unit fermi, to which it is equivalent. The fermi, named in honour of Enrico Fermi, is often encountered in nuclear physics.

Prefix Base 1000 Base 10 Decimal English word Adoption [nb 1]
Name Symbol Short scale Long scale
yotta Y  10008   1024 1000000000000000000000000  septillion  quadrillion 1991
zetta Z  10007   1021 1000000000000000000000  sextillion  trilliard 1991
exa E  10006   1018 1000000000000000000  quintillion  trillion 1975
peta P  10005   1015 1000000000000000  quadrillion  billiard 1975
tera T  10004   1012 1000000000000  trillion  billion 1960
giga G  10003   109 1000000000  billion  milliard 1960
mega M  10002   106 1000000  million 1873
kilo k  10001   103 1000  thousand 1795
hecto h  10002/3   102 100  hundred 1795
deca da  10001/3   101 10  ten 1795
 10000   100 1  one
deci d  1000−1/3   10−1 0.1  tenth 1795
centi c  1000−2/3    10−2 0.01  hundredth 1795
milli m  1000−1   10−3 0.001  thousandth 1795
micro µ  1000−2   10−6 0.000001  millionth 1873
nano n  1000−3   10−9 0.000000001  billionth  milliardth 1960
pico p  1000−4   10−12 0.000000000001  trillionth  billionth 1960
femto f  1000−5   10−15 0.000000000000001  quadrillionth  billiardth 1964
atto a  1000−6   10−18 0.000000000000000001  quintillionth  trillionth 1964
zepto z  1000−7   10−21 0.000000000000000000001  sextillionth  trilliardth 1991
yocto y  1000−8   10−24  0.000000000000000000000001  septillionth  quadrillionth 1991
  1. ^ Prefixes adopted before 1960 already existed before SI. 1873 was the introduction of the CGS system.

References

  1. ^ The International System of Units (SI) (PDF) (8th ed.), ISBN  archived (PDF) from the original on 2017-08-14 
  2. ^ BIPM - Resolution 8 of the 12th CGPM
Other Languages
العربية: فيمتو (سابقة)
български: Фемто-
brezhoneg: Femto
català: Femto-
čeština: Femto
Deutsch: Femto
eesti: Femto-
español: Femto
Esperanto: Femto
euskara: Femto
فارسی: فمتو
français: Femto
galego: Femto-
한국어: 펨토
Հայերեն: Ֆեմտո
हिन्दी: फैम्टो-
Bahasa Indonesia: Femto-
italiano: Femto
ქართული: ფემტო...
lietuvių: Femto-
മലയാളം: ഫെംറ്റോ-
Nederlands: Femto
日本語: フェムト
norsk: Femto
norsk nynorsk: Femto
ភាសាខ្មែរ: ហ្វង់តូ
Plattdüütsch: Femto
polski: Femto
português: Femto
Ripoarisch: Femto
română: Femto
русский: Фемто-
sicilianu: Femto
slovenščina: Femto
کوردی: فێمتۆ-
српски / srpski: Фемто
suomi: Femto
svenska: Femto
ไทย: เฟมโต
Türkçe: Femto-
українська: Фемто-
Tiếng Việt: Femtô
中文: 飞母托