Pico

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For other meanings of Pico see Pico (disambiguation)

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pico- (symbol p) is a prefix denoting a factor of 10-12 in the International System of Units (SI).

From the Italian piccolo (small),[1] it was confirmed in 1960 when the SI was established.[2]

SI prefixes
1000n 10n Prefix Symbol Short scale Long scale Decimal equivalent in SI writing style
10008 1024 yotta Y Septillion Quadrillion 1 000 000 000 000 000 000 000 000
10007 1021 zetta Z Sextillion Trilliard (thousand trillion) 1 000 000 000 000 000 000 000
10006 1018 exa E Quintillion Trillion 1 000 000 000 000 000 000
10005 1015 peta P Quadrillion Billiard (thousand billion) 1 000 000 000 000 000
10004 1012 tera T Trillion Billion 1 000 000 000 000
10003 109 giga G Billion Milliard (thousand million) 1 000 000 000
10002 106 mega M Million 1 000 000
10001 103 kilo k Thousand 1 000
10002/3 102 hecto h Hundred 100
10001/3 101 deca, deka da Ten 10
10000 100 (none) (none) One 1
1000−1/3 10−1 deci d Tenth 0.1
1000−2/3 10−2 centi c Hundredth 0.01
1000−1 10−3 milli m Thousandth 0.001
1000−2 10−6 micro µ (u) Millionth 0.000 001
1000−3 10−9 nano n Billionth Milliardth 0.000 000 001
1000−4 10−12 pico p Trillionth Billionth 0.000 000 000 001
1000−5 10−15 femto f Quadrillionth Billiardth 0.000 000 000 000 001
1000−6 10−18 atto a Quintillionth Trillionth 0.000 000 000 000 000 001
1000−7 10−21 zepto z Sextillionth Trilliardth 0.000 000 000 000 000 000 001
1000−8 10−24 yocto y Septillionth Quadrillionth 0.000 000 000 000 000 000 000 001

[edit] See also

[edit] References

  1. ^ P. Bertan. Etymologie des noms d'unités de mesure (French). Ministère de l'Économie, des Finances et de l'Industrie. Retrieved on March 29, 2007.
  2. ^ Resolution 12 of the 11th CGPM. Bureau International des Poids et Mesures (1961). Retrieved on March 29, 2007.
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