The SI units

Basic units

Quantity	Unit	Symbol
Length	metre	m
Mass	kilogram	kg
Time	second	s
Therm. temp.	kelvin	K
Electr. current	ampere	A
Luminous intens.	candela	cd
Amount of subst.	mol	mol

Extra units

Quantity	Unit	Symbol
Plane angle	radian	rad
solid angle	sterradian	sr

Derived units with special names

Quantity	Unit	Symbol	Derivation
Frequency	hertz	Hz	\(\rm s^{-1}\)
Force	newton	N	\(\rm kg\cdot m\cdot s^{-2}\)
Pressure	pascal	Pa	\(\rm N\cdot m^{-2}\)
Energy	joule	J	\(\rm N\cdot m\)
Power	watt	W	\(\rm J\cdot s^{-1}\)
Charge	coulomb	C	\(\rm A\cdot s\)
El.\ Potential	volt	V	\(\rm W\cdot A^{-1}\)
El.\ Capacitance	farad	F	\(\rm C\cdot V^{-1}\)
El.\ Resistance	ohm	\(\Omega\)	\(\rm V\cdot A^{-1}\)
El.\ Conductance	siemens	S	\(\rm A\cdot V^{-1}\)
Mag.\ flux	weber	Wb	\(\rm V\cdot s\)
Mag.\ flux density	tesla	T	\(\rm Wb\cdot m^{-2}\)
Inductance	henry	H	\(\rm Wb\cdot A^{-1}\)
Luminous flux	lumen	lm	\(\rm cd\cdot sr\)
Illuminance	lux	lx	\(\rm lm\cdot m^{-2}\)
Activity	bequerel	Bq	\(\rm s^{-1}\)
Absorbed dose	gray	Gy	\(\rm J\cdot kg^{-1}\)
Dose equivalent	sievert	Sv	\(\rm J\cdot kg^{-1}\)

Prefixes