SI coherent derived units with special names and symbols

Coherent derived units are products of powers of base units that include no numerical factor other than 1. The base units and coherent derived units of the SI form a coherent set, designated the set of coherent SI units.

To simplify their expression, 22 coherent derived units in the SI have been given special names.

Name	Symbol	Quantity	Expressed in terms of SI base units		Expressed in terms of other SI units
hertz	Hz	frequency	s-1		1/s
radian	rad	angle			m/m
steradian	sr	solid angle			m2/m2
newton	N	force	kg m s‑2
pascal	Pa	pressure, stress	kg m‑1 s‑2		N/m2
joule	J	energy, work, heat	kg m2 s‑2		N m C V W s
watt	W	power, radiant flux	kg m2 s‑3		J/s V A
coulomb	C	electric charge	s A		F V
volt	V	electric potential difference, electromotive force	kg m2 s‑3 A‑1		W/A J/C
farad	F	electric capacitance	kg‑1 m‑2 s4 A2		C/V s/Ω
ohm	Ω	electric resistance, impedance, reactance	kg m2 s‑3 A‑2		1/S V/A
siemens	S	electric conductance	kg‑1 m‑2 s3 A2		1/Ω A/V
weber	Wb	magnetic flux	kg m2 s‑2 A‑1		V s J/A
tesla	T	magnetic flux density, magnetic field strength	kg s‑2 A‑1		Wb/m2
henry	H	inductance	kg m2 s‑2 A‑2		Wb/A
degree Celsius	°C	Celsius temperature	K
lumen	lm	luminous flux	cd		cd sr
lux	lx	illuminance	m-2 cd		lm/m2
becquerel	Bq	activity referred to a radionuclide	s-1		1/s
gray	Gy	absorbed dose (of ionising radiation)	m2 s-2		J/kg
sievert	Sv	dose equivalent (of ionising radiation)	m2 s‑2		J/kg
katal	kat	catalytic activity	s-1 mol