SI unit prefixes

The SI unit prefixes are given in the table below.


prefix symbol factor
yocto $ \mathrm{y}$ $ 10^{-24}$
zepto $ \mathrm{z}$ $ 10^{-21}$
atto $ \mathrm{a}$ $ 10^{-18}$
femto $ \mathrm{f}$ $ 10^{-15}$
pico $ \mathrm{p}$ $ 10^{-12}$
nano $ \mathrm{n}$ $ 10^{-9}$
micro $ \mathrm{\mu}$ $ 10^{-6}$
milli $ \mathrm{m}$ $ 10^{-3}$
centi $ \mathrm{c}$ $ 10^{-2}$
deci $ \mathrm{d}$ $ 10^{-1}$
deka $ \mathrm{da}$ $ 10^{1}$
hecto $ \mathrm{h}$ $ 10^{2}$
kilo $ \mathrm{k}$ $ 10^{3}$
mega $ \mathrm{M}$ $ 10^{6}$
giga $ \mathrm{G}$ $ 10^{9}$
tera $ \mathrm{T}$ $ 10^{12}$
peta $ \mathrm{P}$ $ 10^{15}$
exa $ \mathrm{E}$ $ 10^{18}$
zetta $ \mathrm{Z}$ $ 10^{21}$
yotta $ \mathrm{Y}$ $ 10^{24}$


Here is an example of using the SI unit prefixes: A centimeter is 1 meter * $ 10^{-2}$ or in scientific notation, $ 1\times10^{-2}$ meters.




Reference: National Institute of Standards and Technology, http://physics.nist.gov/cuu/Units/



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