# International System of Units ## Base units | Name | Symbol | Quantity | |:--------:|:------------:|:-------------------------:| | second | $\text{s}$ | time | | metre | $\text{m}$ | length | | kilogram | $\text{kg}$ | mass | | ampere | $\text{A}$ | electric current | | kelvin | $\text{K}$ | thermodynamic temperature | | mole | $\text{mol}$ | amount of substance | | candela | $\text{cd}$ | luminous intensity | ## Derived units with special names and symbols | Name | Symbol | Quantity | Base Units | Other Units | |:--------------:|:------------------:|:------------------------------------------:|:-----------------------------------------------------------:|:--------------------------------------------------------:| | radian | $\text{rad}$ | plane angle | $\text{m}\;\text{m}^{-1}$ | $1$ | | steradian | $\text{sr}$ | solid angle | $\text{m}^{2}\;\text{m}^{-2}$ | $1$ | | hertz | $\text{Hz}$ | frequency | $\text{s}^{-1}$ | $-$ | | newton | $\text{N}$ | force, weight | $\text{kg}\;\text{m}\;\text{s}^{-2}$ | $-$ | | pascal | $\text{Pa}$ | pressure, stress | $\text{kg}\;\text{m}^{-1}\;\text{s}^{-2}$ | $\text{N}\;\text{m}^{-2}$ | | joule | $\text{J}$ | energy, work, heat | $\text{kg}\;\text{m}^{2}\;\text{s}^{-2}$ | $\text{m}\;\text{N}$, $\text{C}\;\text{V}$, $\text{W s}$ | | watt | $\text{W}$ | [[power]], radiant flux | $\text{kg m}^{2}\;\text{s}^{-3}$ | $\text{J s}^{-1}$, $\text{V A}$ | | coulomb | $\text{C}$ | [[electric charge]] | $\text{s A}$ | $\text{F V}$ | | volt | $\text{V}$ | voltage, electromotive force | $\text{kg m}^{2}\;\text{s}^{-3}\;\text{A}^{-1}$ | $\text{W A}^{-1}$, $\text{J C}^{-1}$ | | farad | $\text{F}$ | [[capacitance]] | $\text{kg}^{-1}\;\text{m}^{-2}\;\text{s}^{4}\;\text{A}^{2}$ | $\text{C V}^{-1}$, $\text{s}\;\Omega^{-1}$ | | ohm | $\Omega$ | [[impedance]], resistance, reactance | $\text{kg m}^{2}\;\text{s}^{-3}\;\text{A}^{-2}$ | $\text{S}^{-1}$, $\text{V A}^{-1}$ | | siemens | $\text{S}$ | [[admittance]], conductance, susceptance | $\text{kg}^{-1}\;\text{m}^{-2}\;\text{s}^{3}\;\text{A}^{2}$ | $\Omega^{-1}$, $\text{A}\;\text{V}^{-1}$ | | weber | $\text{Wb}$ | [[magnetic flux]] | $\text{kg m}^{2}\;\text{s}^{-2}\;\text{A}^{-1}$ | $\text{J A}^{-1}$, $\text{T m}^{2}$, $\text{V s}$ | | tesla | $\text{T}$ | magnetic induction, [[Magnetic Field#The B-field\|magnetic flux density]] | $\text{kg s}^{-2}\;\text{A}^{-1}$ | $\text{Wb m}^{-2}$, $\text{N A}^{-1}\;\text{m}^{-1}$ | | henry | $\text{H}$ | [[inductance]] | $\text{kg m}^{2}\;\text{s}^{-2}\;\text{A}^{-2}$ | $\text{Wb A}^{-1}$, $\Omega\;\text{s}$ | | degree Celsius | $^{\circ}\text{C}$ | temperature relative to $273.15\;\text{K}$ | $\text{K}$ | $-$ | | lumen | $\text{lm}$ | luminous flux | $\text{cd}$ | $\text{cd sr}$ | | lux | $\text{lx}$ | illuminance | $\text{cd m}^{-2}$ | $\text{lm m}^{-2}$ | | becquerel | $\text{Bq}$ | radioactivity | $\text{s}^{-1}$ | $-$ | | gray | $\text{Gy}$ | absorbed dose | $\text{m}^{2}\;\text{s}^{-2}$ | $\text{J kg}^{-1}$ | | sievert | $\text{Sv}$ | equivalent dose | $\text{m}^{2}\;\text{s}^{-2}$ | $\text{J kg}^{-1}$ | | katal | $\text{kat}$ | catalytic activity | $\text{mol s}^{-1}$ | $-$ | ## Prefixes | Name | Symbol | Power of 10 | |:-------:|:-----------:|:-----------:| | quetta- | $\text{Q}$ | $10^{30}$ | | ronna- | $\text{R}$ | $10^{27}$ | | yotta- | $\text{Y}$ | $10^{24}$ | | zetta- | $\text{Z}$ | $10^{21}$ | | exa- | $\text{E}$ | $10^{18}$ | | peta- | $\text{P}$ | $10^{15}$ | | tera- | $\text{T}$ | $10^{12}$ | | giga- | $\text{G}$ | $10^{9}$ | | mega- | $\text{M}$ | $10^{6}$ | | kilo- | $\text{k}$ | $10^{3}$ | | hecto- | $\text{h}$ | $10^{2}$ | | deca- | $\text{da}$ | $10^{1}$ | | | | $10^{0}$ | | deci- | $\text{d}$ | $10^{-1}$ | | centi- | $\text{c}$ | $10^{-2}$ | | milli- | $\text{m}$ | $10^{-3}$ | | micro- | $\upmu$ | $10^{-6}$ | | nano- | $\text{n}$ | $10^{-9}$ | | pico- | $\text{p}$ | $10^{-12}$ | | femto- | $\text{f}$ | $10^{-15}$ | | atto- | $\text{a}$ | $10^{-18}$ | | zepto- | $\text{z}$ | $10^{-21}$ | | yocto- | $\text{y}$ | $10^{-24}$ | | ronto- | $\text{r}$ | $10^{-27}$ | | quecto- | $\text{q}$ | $10^{-30}$ |