Pico-
Multi tool use
This article is about the SI prefix. For other uses, see Pico (disambiguation).
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Look up pico- in Wiktionary, the free dictionary. |
Pico- (symbol p) is a unit prefix in the metric system denoting one trillionth, a factor of 10−12 (0.000000000001).
Derived from the Spanish pico, meaning peak, beak, bit,[1] this was one of the original 12 prefixes defined in 1960 when the International System of Units was established.[2]
The radius of atoms range from 25 picometers (hydrogen) to 260 picometers (caesium). One picolight-year is about nine kilometers (six miles).
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|---|
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 (Proposed)
|
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 (Proposed)
|
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
|
|
|
^ Prefixes adopted before 1960 already existed before SI. 1873 was the introduction of the CGS system.
See also
References
^ "pico- - definition of pico- by the Free Online Dictionary, Thesaurus and Encyclopedia". Retrieved 2013-06-25..mw-parser-output cite.citation{font-style:inherit}.mw-parser-output .citation q{quotes:"""""""'""'"}.mw-parser-output .citation .cs1-lock-free a{background:url("//upload.wikimedia.org/wikipedia/commons/thumb/6/65/Lock-green.svg/9px-Lock-green.svg.png")no-repeat;background-position:right .1em center}.mw-parser-output .citation .cs1-lock-limited a,.mw-parser-output .citation .cs1-lock-registration a{background:url("//upload.wikimedia.org/wikipedia/commons/thumb/d/d6/Lock-gray-alt-2.svg/9px-Lock-gray-alt-2.svg.png")no-repeat;background-position:right .1em center}.mw-parser-output .citation .cs1-lock-subscription a{background:url("//upload.wikimedia.org/wikipedia/commons/thumb/a/aa/Lock-red-alt-2.svg/9px-Lock-red-alt-2.svg.png")no-repeat;background-position:right .1em center}.mw-parser-output .cs1-subscription,.mw-parser-output .cs1-registration{color:#555}.mw-parser-output .cs1-subscription span,.mw-parser-output .cs1-registration span{border-bottom:1px dotted;cursor:help}.mw-parser-output .cs1-ws-icon a{background:url("//upload.wikimedia.org/wikipedia/commons/thumb/4/4c/Wikisource-logo.svg/12px-Wikisource-logo.svg.png")no-repeat;background-position:right .1em center}.mw-parser-output code.cs1-code{color:inherit;background:inherit;border:inherit;padding:inherit}.mw-parser-output .cs1-hidden-error{display:none;font-size:100%}.mw-parser-output .cs1-visible-error{font-size:100%}.mw-parser-output .cs1-maint{display:none;color:#33aa33;margin-left:0.3em}.mw-parser-output .cs1-subscription,.mw-parser-output .cs1-registration,.mw-parser-output .cs1-format{font-size:95%}.mw-parser-output .cs1-kern-left,.mw-parser-output .cs1-kern-wl-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right,.mw-parser-output .cs1-kern-wl-right{padding-right:0.2em}
^ "Resolution 12 of the 11th CGPM". Bureau International des Poids et Mesures. 1961. Retrieved 2007-03-29.
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