Quantity

Name of unit

Symbol

SI base units

length

meter

m

mass

kilogram

kg

time

second

s

electric current

ampere

A

thermodynamic temperature

kelvin

K

amount of substance

mole

mol

luminous intensity

acandela

cd

SI derived units

Equivalent

Units

area

square meter

m²

volume

cubic meter

m³

frequency

hertz

Hz

s^-1

mass density (density)

kilogram per cubic meter

kg/m³

speed, velocity

meter per second

m/s

angular velocity

radian per second

rad/s

acceleration

meter per second squared

m/s2

angular acceleration

radian per second squared

rad/s²

force

newton

N

kg. m/s²

pressure (mechanical stress)

pascal

Pa

N/m²

kinematic viscosity

square meter per second

m²/s

dynamic viscosity

newton-second per square meter

N s/m²

energy, quantity of heat

joule

J

N.m

power

watt

W

J/s

quantity of electricity

coulomb

C

A.s

potential difference, electromotive force

volt

V

J/C, W/A

electric field strength

volt per meter

V/m

N/C

electric resistance

ohm

O

V/A

capacitance

farad

F

A.s/V

magnetic flux

weber

Wb

V.s

inductance

henry

magnetic flux density

tesla

T

Wb/m²

magnetic field strength

ampere per meter

A/m

magnetomotive force

ampere

A

luminous flux

lumen

lm

cd.sr

luminance

candela per square meter

cd/m²

illuminance

lux

lx

lm/m²

wave number

1 per meter

m^-1

entropy

joule per kelvin

J/K

specific heat capacity

joule per kilogram-kelvin

J/kg.K

thermal conductivity

watt per meter-kelvin

W/m.K

radiant intensity

watt per steradian

W/sr

activity (of a radioactive source)

becquerel

Bq

s^-1

radiation dose

gray

Gy

J/kg

radiation dose equivalent

sievert

Sv

J/kg

SI supplementary units

plane angle

radian

rad

solid angle

steradian

sr