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IEVref:112-02-03ID:
Language:enStatus: Standard
Term: SI prefix
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Definition: unit prefix used together with a SI unit to form decimal multiples or submultiples of this unit

NOTE 1 – The list of approved SI prefixes is given in the following table:

Multiples

Submultiples

Factor

Prefix

Factor

Prefix

Name

Symbol

Name

Symbol

101

déca

da

10–1

déci

d

102

hecto

h

10–2

centi

c

103

kilo

k

10–3

milli

m

106

méga

M

10–6

micro

μ

109

giga

G

10–9

nano

n

1012

téra

T

10–12

pico

p

1015

péta

P

10–15

femto

f

1018

exa

E

10–18

atto

a

1021

zetta

Z

10–21

zepto

z

1024

yotta

Y

10–24

yocto

y

NOTE 2 – When the prefixes are used, the prefix name and the unit name are combined to form a single word, and similarly the prefix symbol and the unit symbol are written without any space to form a single symbol, which may itself be raised to any power. For example, we may write: kilometre, km; microvolt, μV; femtosecond, fs; 50 V/cm = 50 V (10–2 m)–1 = 5000 V/m. See the SI Brochure for more information.

NOTE 3 – As an exception, multiples and submultiples of the kilogram are written by combining a prefix with the gram, such we write: milligram, mg, not microkilogram, µkg.


Publication date:2010-01
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