A.2 Derived SI Units

Quantity SI Unit Symbol Formula
activity of radionuclides becquerel Bq s–1
capacitance farad F C V–1
electric potential volt V W A–1
electric resistance ohm Ω V A–1
energy, work, quantity of heat joule J N · s
force newton N kg · m s–2
frequency hertz Hz s–1
power, radiant flux watt W J s–1
pressure pascal Pa N m–2
quantity of electricity, electric charge coulomb C A · s




acceleration meter per second squared m s–2
area square meter m2
density, mass kilogram per cubic meter kg m–3
entropy joule per kelvin J K–1
heat capacity joule per kelvin J K–1
molar energy joule per mole J mol–1
molar entropy joule per mole-kelvin J mol–1 K–1
specific energy joule per kilogram J kg–1
specific entropy joule per kilogram-kelvin J kg–1 K–1
specific volume cubic meter per kilogram m3 kg–1
specific-heat capacity joule per kilogram-kelvin J kg–1 K–1
surface tension newton per meter N m–1
velocity meter per second m s–1
viscosity, dynamic pascal-second Pa · s
viscosity, kinematic square meter per second m2 s–1
volume cubic meter m3
wavenumber 1 per meter 1 m–1