SI Derived Unit - Derived Units With Special Names

Derived Units With Special Names

In addition to the two dimensionless derived units radian (rad) and steradian (sr), 20 other derived units have special names.

Named units derived from SI base units
Name Symbol Quantity Expression in terms of other units Expression in terms of SI base units
hertz Hz frequency 1/s s−1
radian rad angle m/m dimensionless
steradian sr solid angle m2/m2 dimensionless
newton N force, weight kg⋅m/s2 kg⋅m⋅s−2
pascal Pa pressure, stress N/m2 kg⋅m−1⋅s−2
joule J energy, work, heat N⋅m = C⋅V = W⋅s kg⋅m2⋅s−2
watt W power, radiant flux J/s = V⋅A kg⋅m2⋅s−3
coulomb C electric charge or quantity of electricity s⋅A s⋅A
volt V voltage, electrical potential difference, electromotive force W/A = J/C kg⋅m2⋅s−3⋅A−1
farad F electric capacitance C/V kg−1⋅m−2⋅s4⋅A2
ohm Ω electric resistance, impedance, reactance V/A kg⋅m2⋅s−3⋅A−2
siemens S electrical conductance 1/Ω = A/V kg−1⋅m−2⋅s3⋅A2
weber Wb magnetic flux J/A kg⋅m2⋅s−2⋅A−1
tesla T magnetic field strength, magnetic flux density V⋅s/m2 = Wb/m2 = N/(A⋅m) kg⋅s−2⋅A−1
henry H inductance V⋅s/A = Wb/A kg⋅m2⋅s−2⋅A−2
degree Celsius °C temperature relative to 273.15 K K K
lumen lm luminous flux cd⋅sr cd
lux lx illuminance lm/m2 m−2⋅cd
becquerel Bq radioactivity (decays per unit time) 1/s s−1
gray Gy absorbed dose (of ionizing radiation) J/kg m2⋅s−2
sievert Sv equivalent dose (of ionizing radiation) J/kg m2⋅s−2
katal kat catalytic activity mol/s s−1⋅mol

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