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SI Units and Symbols used in the Guide
Subject

Physical Quantity

Symbol

Name

Unit

Mass

m, M

kilogram

kg

Linear position
Length, Distance
Radius

x, r
l, d
R

meter

m

t,

second

s

,

radian

rad

steradian

sr

Time
Linear angle,
Angular position
Spherical angle
Area

A

-

m2

Volume

V

-

m3

Moment of inertia

I

-

kg*m2

-

kg/m3

-

m/s

-

rad/s

Density
Mechanics

Linear velocity

Angular velocity

v, u, c
,

Linear momentum

p

-

kg*m/s

Angular momentum

L

-

kg*m2/s

Linear acceleration

a

-

m/s2

-

rad/s2

newton

N=kg*m/s2

-

N*m

Angular acceleration
Force

F

Torque
Impulse

I

-

N*s

Work
Energy

W
E

joule

J=N*m

Power

P

watt

W=J/s

-

Pa*s

Dynamic viscosity
Electricity and
Magnetism

Current

I

ampere

A

Charge

Q, q, e

coulomb

C=A*s

Current density

j

-

A/m2


Volume charge
density

-

C/m3

Surface charge
density

-

C/m2

Linear charge
density

-

C/m

Electric potential
Voltage
emf

V

volt

V=J/C

Electric field

E

-

N/C, V/m

-

V*m
C*m

Electric flux
Electric moment

pe

-

Resistance

R, r

ohm

=V/A

-

*m

Specific resistance
Capacitance

C

Specific
conductivity
Magnetic field

B

Magnetic flux

Thermodynamics

farad

F=C/V
(

*m)-1

tesla

T=N/(A*m)

weber

Wb=T*m2=V*s

Inductance
Mutual-inductance

L
M

henri

H=Wb/A

Magnetic moment

pm

-

A*m2

Polarization

P

-

C/m2

Magnetization

I

-

A/m

Temperature

T

kelvin

K

Substance quantity

M

mole

mol

Pressure

P

-

Pa

Heat

Q

-

J

Heat capacity
Entropy

C
S

-

J/K

Specific heat

c

-

J/(kg*K)

Molar heat

cm

-

J/(mol*K)

energy flux

j

-

W/m2

Surface tension

-

N/m

Stress

pascal

Pa=N/m2


Elasticity modulus

E

Wavelength

Oscillations and
Waves

Optics

Quantum Physics

-

m

Wave number

k

-

m-1

Frequency

f

hertz

Hz

-

J/m3

Energy density
Energy flux

J

-

J/m2

Intensity

I

-

J/(m2*s)

Reactance
Impedance

X
Z

ohm

Focal length

f

-

m

Luminous intensity

I

candela

cd

lumen

lm=cd*m2

Luminous flux

=V/A

Illuminance

E

lux

lk=lm/m2

Brightness

L

-

cd/m2

Linear absorption
coefficient

-

m-1

Mass absorption
coefficient

-

m2/kg

Radioactive activity

A

becquerel

Bq=s-1

Absorbed dose

D

gray

Gy=J/kg