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SI Units. scenta.co.uk SI Base Units Quantity Name Symbol Length metre m Mass kilogram kg Time second s Electric Current ampere A Thermodynamic Temperature kelvin K Amount of Substance mole mol Luminous Intensity candela cd SI Derived Units Quantity Name Symbol Area square metre m2 Volume cubic metre m3 Speed / Velocity metre per second m/s Acceleration metre per second squared m/s2 Wave Number reciprocal metre m-1 Density / Mass Density kilogram per cubic metre kg/m3 Specific Volume cubic metre per kilogram m3/kg Current Density ampere per square metre A/m2 Magnetic Field Strength ampere per metre A/m Concentration mole per cubic metre mol/m3 Luminance candela per square metre cd/m2 Refractive index one 1

SI Derived Units With Special Names Quantity Name Symbol Expression in terms of other SI units Expression in terms of SI base units Plane angle radian rad 1 Solid angle steradian sr 1 Frequency hertz Hz s-1 Force newton N kg m s-2 Pressure, Stress pascal Pa N/m2 kg m-1 s-2 Energy, Work, Quantity of Heat joule J N m kg m2 s-2 Power, Radiant Flux watt W J/s kg m2 s-3 Electric Charge, Quantity of Electricity coulomb C s A Electric Potential, Potential Difference, Electromotive Force volt V W/A kg m2 s-3 A-1 Capacitance farad F C/V kg-1 m-2 s4 A2 Electric Resistance ohm Ω V/A kg m2 s-2 A-1 Electric Conductance siemens S A/V kg-1 m-2 s3 A2 Magnetic Flux weber Wb V s kg m2 s-2 A-1 Magnetic Flux Density tesla T Wb/m2 kg s-2 A-1 Inductance henry H Wb/A kg M2 s-2A-2 Celsius Temperature degree celsius °C K Luminous Flux lumen lm cd sr Illuminance lux lx lm/m2 m-2 cd sr Activity of a Radionuclide bequerel Bq s-1 Absorbed Dose, Specific Energy Imparted, Kerma, Absorbed Dose Index gray Gy J/kg m2 s-2 Dose Equivalent, Dose Equivalent Index sievert Sv J/kg m2 s-2 equivalent, personal dose equivalent, organ equivalent dose SI Derived Units Expressed by Means of Special Names Quantity Name Symbol Expression in terms of SI base units Dynamic Viscosity pascal second Pa s kg m-1 s-1 Moment of Force newton meter N m kg M2 s-2 Surface Tension newton per metre N/m kg s-2 Heat Flux Density / Irradiance watt per square metre W/m2 s-3 Heat Capacity / Entropy joule per kelvin J/K kg m 2 s-2 K-1 Specific Heat Capacity / Specific Entropy joule per kilogram kelvin J/(kg K) m2 s-2 K-1 Specific Energy joule per kilogram J/kg m 2 s-2 Thermal Conductivity watt per metre kelvin W/(m K) kg m s-3 K-1 Energy Density joule per cubic metre J/m3 kg m-1 s-2 Electric Field Strength volt per metre V/m kg m s-3 A-1 Electric Charge Density coulomb per cubic metre C/m3 m-3 s A Electric Flux Density coulomb per square metre C/m2 m-2 s A Permittivity farad per metre F/m kg-1 m-3 s4 A2 Permeability henry per metre H/m kg m s-2 A-2 Molar Energy joule per mole J/mol kg m2 s-2 mol-1 Molar Entropy / Molar Heat Capacity joule per mole kelvin J/(mol K) kg m2 s-2 K-1 mol-1 Exposure (x and γ rays) coulomb per kilogram C/kg kg-1 s A Absorbed Dose Rate gray per second Gy/s M2 s-3 Radiant intensity watt per steradian W sr-1 m2 kg s-3 Radiance watt per square metre steradian W m-2 sr-1 kg s-3 SI Supplementary Units Quantity Name Symbol Expression in terms of SI base units Plane Angle radian rad m m-1 = 1 Solid Angle steradian sr m2 m-2 = 1 SI Derived Units Formed Using Supplementary Units Quantity Name Symbol Angular Velocity radian per second rad/s Angular Acceleration radian per second squared rad/s2 Radiant Intensity watt per steradian W/sr Radiance watt per square metre steradian W/(m2 sr)