Quantity

Unit

Expression

 

Name

Symbol

In other SI units

In terms of SI base units

Plane angle

radian

rad

 

m.m^-1

Solid angle

steradian

sr

 

m².m^-2

Frequency

hertz

Hz

 

s^-1

Force

newton

N

 

m.kg.s^-2

Pressure, stress

pascal

Pa

N.m^-2

m^-1.kg.s^-2

Energy, work; quantity of heat

joule

J

N.m

m².kg.s^-2

Power⁽¹⁾, radiant flux

watt

W

J.s^-1

m².kg.s^-3

Quantity of electricity, electric charge

coulomb

C

 

s.A

Electric potential, potential difference, electromotive force

volt

V

W.A^-1

m².kg.s^-3.A^-1

Electric resistance

ohm

Ω

V.A^-1

m².kg.s^-3.A^-2

Conductance

siemens

S

A.V^-1

m^-2.kg^-1.s³.A²

Capacitance

farad

F

C.V^-1

m^-2.kg^-1.s⁴.A²

Magnetic flux

weber

Wb

V.s

m².kg.s^-2.A^-1

Magnetic flux density

tesla

T

Wb.m^-2

kg.s^-2.A^-1

Inductance

henry

H

Wb.A^-1

m².kg.s^-2.A^-2

Luminous flux

lumen

lm

cd.sr

cd

Illuminance

lux

lx

lm.m^-2

m^-2.cd

Activity (of a radionuclide)

becquerel

Bq

 

s^-1

Absorbed dose, specific energy imparted, kerma, absorbed dose index

gray

Gy

J.kg^-1

m².s^-2

Dose equivalent

sievert

Sv

J.kg^-1

m².s^-2

Catalytic activity

katal

kat

 

mol.s^-1

In particular, derived SI units may be expressed by the special names and symbols given in the above table. For example, the SI unit of dynamic viscosity may be expressed as m^-1.kg.s^-1 or N.s.m^-2 or Pa.s.