SI Units

SI base units

length m (meter)

mass kg (kilogram)

time s (second)

electric A (ampere)

thermodynamic temperature K (kelvin)

amount of substance mol (mole)

luminous intensity cd (candela)

SI coherent derived units

area m2 (meter)

volume m3 (cubic meter)

speed, velocity m/s (meter per second)

acceleration m/s2 (meter per second squared)

wavenumber m-1 (reciprocal meter)

density, mass density kg/m3 (kilogram per cubic meter)

surface density kg/m2 (kilogram per square meter)

specific volume m3/kg (cubic meter per kilogram)

current density A/m2 (ampere per meter squared)

magnetic field strength A/m (ampere per meter)

amount concentration mol/m3 (mole per cubic meter)

mass concentration kg/m3 (kilogram per cubic meter)

luminance cd/m2 (candela per square meter)

refractive index

relative permeability

SI coherent derived units - special

plane angle rad (radian)

solid angle sr (steradian)

frequency Hz (hertz)

force N (newton)

pressure, stress Pa (pascal) N/m2

energy, work, amount of heat J (joule) N m

power, radian flux W (watt) J/s

amount of electricity, charge C (coulmb)

electric force V (volt) W/A

capacitance F (farad) C/V

electrical resistance Ω  (ohm) V/A

electrical conductance S (siemens) A/V

magnetic flux Wb (weber) V s

magnetic flux density T (tesla) Wb/m2

inductance H (henry) Wb/A

Celsius temperature ºC (degree Celsius)

luminance flux lm (lumen) cd sr

illuminance lx (lux) lm/m2

 catalytic activity kat (katal) C

SI coherent derived units with special symbols

dynamic viscosity Pa s (pascal second)

moment of force N m (newton meter)

surface tension N/m (newton per meter)

angular velocity rad/s (radian per second)

angular acceleration rad/s2  (radians per second squared)

heat flux density, irradiance W/m2 (watt per square meter)

specific heat capacity J/kg K (joule per kilogram kelvin)

specific energy J/kg (joule per kilogram)

thermal conductivity W/m K (watt per meter kelvin)

energy density J/m3  (joule per meter squared)

electric field strength V/m  ( volt per meter)

electric charge density C/m3  (coulomb per cubic meter

surface charge density C/m2 (coulomb per square meter)

electric flux density C/m2 (coulomb per square meter)

permittivity F/m (farad per meter)

permeability H/m (henry per meter)

molar energy J/mol (joule per mole)

molar entropy/heat capacity J/mol K (joule per mole kelvin)

exposure (x- and  γ-rays) C/kg (coulomb per kilogram)

absorbed dose rate Gy/s (gray per second

radiant intensity W/sr (watt per steradian)

radiance W/m2 sr (watt per meter squared steradian)