SI-Derived Units

Physical Quantity	Name	Symbol	Expressed in SI Base Units
frequency	hertz	Hz	s-1
force	newton	N	m kg s-2
pressure, stress	pascal	Pa	N m-2 = m-1 kg s-2
energy, work, heat	joule	J	N m = m2 kg s-2
power, radiant flux	watt	W	J s-1 = m2 kg s-3
electrical charge	coulomb	C	A s
electrical potential, electromotive force	volt	V	J C-1 = m2 kg s-3 A-1
electrical resistance	ohm	Ω	V A-1 = m2 kg s-3 A-2
electric conductance	siemens	S	ohm-1 = m-2 kg-1 s3 A2
electical capacitance	farad	F	C V-1 = m-2 kg-1 s4 A2
magnetic flux density	tesla	T	V s m-2 = kg s-2 A-1
magnetic flux	weber	Wb	V s = m2 kg s-2 A-1
inductance	henry	H	V A-1 s = m2 kg s-2 A-2
luminous flux	lumen	lm	cd sr
illuminance	lux	lx	cd sr m-2
radioactive activity	becquerel	bq	s-1
absorbed dose of radiation	gray	Gy	J kg-1 = m2 s-2
dose equivalent of radiation	sievert	Sv	J kg-1 = m2 s-2
plane angle	radian	rad	1 m m-1
solid angle	steradian	sr	1 m2 m-2
area	square metre	A	m2
volume	cubic metre	V	m3
speed, velocity	metre per second	v	m/s
acceleration	metre per second squared	a	m/s2
wavenumber	reciprocal metre	σ	m–1
density, mass density	kilogram per cubic metre	ρ	kg/m3
surface density	kilogram per square metre	ρA	kg/m2
specific volume	cubic metre per kilogram	v	m3/kg
current density	ampere per square metre	j	A/m2
magnetic field strength	ampere per metre	H	A/m
concentration	mole per cubic metre	c	mol/m3
mass concentration	kilogram per cubic metre	ρ, γ	kg/m3
luminance	candela per square metre	Lv	cd/m2
refractive index	one	n	1
relative permeability	one	µr	1