Derived
quantity

Symbol

Description

SI units

Plane angle

θ

Measure of a change in direction or orientation.

radian (rad)

Solid angle

Ω

Measure of the size of an object as projected on a sphere.

steradian (sr)

Absorbed dose rate


Absorbed dose received per unit of time.

Gy s^{−1}

Acceleration

a

Rate of change of the speed or velocity of an object.

m s^{−2}

Angular acceleration

α

Rate of change in angular speed or velocity.

rad s^{−2}

Angular speed (or angular velocity)

ω or ω

The angle incremented in a plane by a segment connecting
an object and a reference point.

rad s^{−1}

Angular momentum

L

Measure of the extent and direction and object rotates
about a reference point.

kg m^{2} s^{−1}

Area

A

The two dimensional extent of an object.

m^{2}

Area density

ρ_{A}

The amount of mass per unit area of a two dimensional
object.

kg m^{−2}

Capacitance

C

Measure for the amount of stored charge for a given
potential.

farad (F = A^{2} s^{4} kg^{−1} m^{−2})

Catalytic activity


Change in reaction rate due to presence of a catalyst.

katal (kat = mol s^{−1})

Catalytic activity concentration


Change in reaction rate due to presence of a catalyst per
unit volume of the system.

kat m^{−3}

Chemical potential

μ

The amount of energy needed to add a particle to a system.

J mol^{−1}

Molar concentration

C

Amount of substance per unit volume.

mol m^{−3}

Current density

J

Amount of electric current flowing through a surface.

A m^{−2}

Dose equivalent

H

Measure for the received amount of radiation adjusted for
the effect of different types of radiant on biological tissue.

sievert (Sv = m^{2} s^{−2})

Dynamic Viscosity

η

Measure for the resistance of an incompressible fluid to
stress.

Pa s

Electric Charge

Q

Amount of electric charge.

coulomb (C = A s)

Electric charge density

ρ_{Q}

Amount of electric charge per unit volume.

C m^{−3}

Electric displacement

D

Strength of the electric displacement.

C m^{−2}

Electric field strength

E

Strength of the electric field.

V m^{−1}

Electrical conductance

G

Meausure for how easily current flows through a material.

siemens (S = A^{2} s^{3} kg^{−1} m^{−2})

Electric potential

V

The amount of work required to bring a unit charge into an
electric field from infinity.

volt (V = kg m^{2} A^{−1} s^{−3})

Electrical resistance

R

The degree to which an object opposes the passage of an
electric current.

ohm (Ω = kg m^{2} A^{−2} s^{−3})

Energy

E

The capacity of a body or system to do work.

joule (J = kg m^{2} s^{−2})

Energy density

ρ_{E}

Amount of energy per unit volume.

J m^{−3}

Entropy

S

Measure for the amount of available states for a system.

J K^{−1}

Force

F

The cause of acceleration, acting on an object.

newton (N = kg m s^{−2})

Impulse

p

The cause of a change in momentum, acting on an object.

kg m s^{−1}

Frequency

f

The number of times something happens in a period of time.

hertz (Hz =s^{−1})

Halflife

t_{1/2}

The time needed for a quantity to decay to half its
original value.

s

Heat

Q

Amount of energy transferred between systems due to
temperature difference.

J

Heat capacity

C_{p}

Amount of energy needed to raise the temperature of a
system by one degree.

J K^{−1}

Heat flux density

ϕ_{Q}

Amount of heat flowing through a surface per unit area.

W m^{−2}

Illuminance

E_{v}

Total luminous flux incident to a surface per unit area.

lux (lx = cd sr m^{−2})

Impedance

Z

Measure for the resistance of an electrical circuit
against an alternating current.

ohm (Ω = kg m^{2} A^{−2} s^{−3})

Index of refraction

n

The factor by which the speed of light is reduce in a
medium.


Inductance

L

Measure for the amount of magnetic flux generated for a
certain current run through a circuit.

henry (H = kg m^{2} A^{−2} s^{−2})

Irradiance

E

Power of electromagnetic radiation flowing through a
surface per unit area.

W m^{−2}

Linear density

ρ_{l}

Amount of mass per unit length of a one dimensional
object.


Luminous flux (or luminous power)

F

Perceived power of a light source.

lumen (lm = cd sr)

Magnetic field strength

H

Strength of a magnetic field in a material.

A m^{−1}

Magnetic flux

Φ

Measure of quantity of magnetism, taking account of the
strength and the extent of a magnetic field.

weber (Wb = kg m^{2} A^{−1} s^{−2})

Magnetic flux density

B

Measure for the strength of the magnetic field.

tesla (T = kg A^{−1} s^{−2})

Magnetization

M

Amount of magnetic moment per unit volume.

A m^{−1}

Mass fraction

x

Mass of a substance as a fraction of the total mass.

kg/kg

(Mass) Density (volume density)

ρ

The amount of mass per unit volume of a three dimensional
object.

kg m^{−3}

Mean lifetime

τ

Average time needed for a particle to decay.

s

Molar energy


Amount of energy present is a system per unit amount of
substance.

J mol^{−1}

Molar entropy


Amount of entropy present in a system per unit amount of
substance.

J K^{−1} mol^{−1}

Molar heat capacity

c

Heat capacity of a material per unit amount of substance.

J K^{−1} mol^{−1}

Moment of inertia

I

Inertia of an object with respect to angular acceleration.

kg m^{2}

Momentum

p

Product of an object's mass and velocity.

N s

Permeability

μ

Measure for how the magnetization of material is affected
by the application of an external magnetic field.

H m^{−1}

Permittivity

ε

Measure for how the polarization of a material is affected
by the application of an external electric field.

F m^{−1}

Power

P

The rate of change in energy over time.

watt (W)

Pressure

p

Amount of force per unit area.

pascal (Pa = kg m^{−1} s^{−2})

(Radioactive) Activity

A

Number of particles decaying per unit time.

becquerel (Bq = s^{−1})

(Radioactive) Dose

D

Amount of energy absorbed by biological tissue from
ionizing radiation per unit mass.

gray (unit) (Gy = m^{2} s^{−2})

Radiance

L

Power of emitted electromagnetic radiation per solid angle
and per projected source area.

W m^{−2} sr^{−1}

Radiant intensity

I

Power of emitted electromagnetic radiation per solid
angle.

W sr^{−1}

Reaction rate

r

Measure for speed of a chemical reaction.

mol m^{−3} s^{−1}

Speed

v

Rate of change of the position of an object.

m s^{−1}

Specific energy


Amount of energy present per unit mass.

J kg^{−1}

Specific heat capacity

c

Heat capacity per unit mass.

J kg^{−1} K^{−1}

Specific volume

v

The volume occupied by a unit mass of material (reciprocal
of density).

m^{3} kg^{−1}

Spin

S

Intrinsic property of particles, roughly to be interpreted
as the intrinsic angular momentum of the particle.

kg m^{2} s^{−1}

Stress

σ

Amount of force exerted per surface area.

Pa

Surface tension

γ

Amount of work needed to change the surface of a liquid by
a unit surface area.

N m^{−1} or J m^{−2}

Thermal conductivity

k

Measure for the ease with which a material conducts heat.

W m^{−1} K^{−1}

Torque (moment of force)

τ

Product of a force and the perpendicular distance of the
force from the point about which it is exerted.

N m

Velocity

v

Speed of an object in a chosen direction.

m s^{−1}

Volume

V

The three dimensional extent of an object.

m^{3}

Wavelength

λ

Distance between repeating units of a propagating wave.

m

Wavenumber

k

Reciprocal of the wavelength.

m^{−1}

Weight

w

Amount of gravitation force exerted on an object.

newton (N = kg m s^{−2})

Work

W

Energy dissipated by a force moving over a distance,
scalar product of the force and the movement vector.

joule (J = kg m^{2} s^{−2})

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Name and Symbols of Different Physical Terms, Descriptions and SI Units
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