Close

Search

Search Menu
Photonics Media Photonics Buyers' Guide Photonics Spectra BioPhotonics EuroPhotonics Vision Spectra Photonics Showcase Photonics ProdSpec Photonics Handbook
More News

SI Prefixes

Facebook Twitter LinkedIn Email Comments

International System of Units (SI)

SI Prefixes


Multiples

Factor

Name

Symbol

 1024

yotta

Y

 1021

zetta

Z

1018

exa

E

1015

peta

P

1012

tera

T

109

giga

G

106

mega

M

103

kilo

k

102

hecto

h

101

deka

da

 

 

 

 


Submultiplies


Factor

Name

Symbol

10−1

deci

d

10−2

centi

c

10−3

milli

m

10−6

micro

µ

10−9

nano

n

10−12

pico

p

10−15

femto

f

10−18

atto

a

10−21

zepto

z

10−24

yocto

y



Note: The kilogram is the only SI unit with a prefix as part of its name and symbol. Because multiple prefixes are not allowed, the kilogram and prefix names are used with the unit name gram and the prefix symbols are used with the unit symbol g. Other than in this case, any SI prefix may be used with any SI unit, including the degree Celsius and its symbol °C.

Example: 10–6 kg = 1 mg (one milligram),
               but not 10–6 kg = 1 μkg (one microkilogram)


Source: National Institute of Standards and Technology (NIST)

Photonics Handbook
General Referencekilomicronano

Comments
back to top
Facebook Twitter Instagram LinkedIn YouTube RSS
©2019 Photonics Media, 100 West St., Pittsfield, MA, 01201 USA, info@photonics.com

Photonics Media, Laurin Publishing
x We deliver – right to your inbox. Subscribe FREE to our newsletters.
We use cookies to improve user experience and analyze our website traffic as stated in our Privacy Policy. By using this website, you agree to the use of cookies unless you have disabled them.