The number of quantities in science is without limit, and it is not possible to provide a complete list of derived quantities and derived units. However, Table 2 lists some examples of derived quantities, and the corresponding coherent derived units expressed directly in terms of base units.

Table 2. Examples of coherent derived units in the SI expressed in terms of base units

Derived quantity			SI coherent derived unit
Name	Symbol		Name	Symbol
area	A		square metre	m2
volume	V		cubic metre	m3
speed, velocity			metre per second	m/s
acceleration	a		metre per second squared	m/s2
wavenumber	,		reciprocal metre	m–1
density, mass density			kilogram per cubic metre	kg/m3
surface density	A		kilogram per square metre	kg/m2
specific volume	v		cubic metre per kilogram	m3/kg
current density	j		ampere per square metre	A/m2
magnetic field strength	H		ampere per metre	A/m
amount concentration (a), concentration	c		mole per cubic metre	mol/m3
mass concentration	,		kilogram per cubic metre	kg/m3
luminance	Lv		candela per square metre	cd/m2
refractive index (b)	n		one	1
relative permeability (b)	r		one	1
(a) In the field of clinical chemistry this quantity is also called substance concentration. (b) These are dimensionless quantities, or quantities of dimension one, and the symbol "1" for the unit (the number "one") is generally omitted in specifying the values of dimensionless quantities.