SI derived unit

An SI derived unit is a unit of measurement that can be expressed as a combination of one or more SI base units. A unit that is dimensionless is also called a derived unit. There are special names for 22 of these units.

Named units derived from SI base units
Name Symbol Quantity Definition

other units

Definition

SI base units

radian rad plane angle −
steradian sr solid angle −
hertz Hz frequency s−1
newton N force, weight m⋅kg⋅s−2
pascal Pa pressure, stress N/m2 m−1⋅kg⋅s−2
joule J energy, work, heat N⋅m m2⋅kg⋅s−2
watt W power, radiant flux J/s m2⋅kg⋅s−3
coulomb C electric charge s⋅A
volt V voltage, electrical potential difference, electromotive force W/A

J/C

m2⋅kg⋅s−3⋅A−1
farad F electrical capacitance C/V m−2⋅kg−1⋅s4⋅A2
ohm Ω electrical resistance, impedance, reactance V/A m2⋅kg⋅s−3⋅A−2
siemens S electrical conductance 1/Ω m−2⋅kg−1⋅s3⋅A2
weber Wb magnetic flux J/A m2⋅kg⋅s−2⋅A−1
tesla T magnetic field strength Wb/m2

V⋅s/m2 N/(A⋅m)

kg⋅s−2⋅A−1
henry H inductance Wb/A

V⋅s/A

m2⋅kg⋅s−2⋅A−2
degree Celsius °C temperature relative to 273.15 K TK − 273.15 K
lumen lm luminous flux cd⋅sr cd
lux lx illuminance lm/m2 m−2⋅cd
becquerel Bq radioactivity (decays per unit time) 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 s−1⋅mol
This article is issued from Wikipedia. The text is available under Creative Commons Attribution-Share Alike 4.0 unless otherwise noted. Additional terms may apply for the media files.