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Physics reference

Physics Symbols & SI Units

Search common quantities, their conventional symbols, and the SI units supplied in the reference table.

Bounded catalog

Browse symbols

98 symbols found. Only 25 are rendered per page.

Showing up to 25 symbols per page
n

Index of refraction

Physical symbol

Quantity
Scalar
SI unit
Unitless
L

Level

Physical symbol

Quantity
Scalar
SI unit
Decibel
P

Power of a lens

Physical symbol

Quantity
Scalar
SI unit
Dioptre
λ

Wavelength

lambda

Quantity
Scalar
SI unit
Meter
v, c

Wave speed

Physical symbol

Quantity
Scalar
SI unit
Meter per second
n

Amount of substance

Physical symbol

Quantity
Scalar
SI unit
Mole
COP

Coefficient of performance

Physical symbol

Quantity
Scalar
SI unit
Unitless
ε

Emissivity

Epsilon

Quantity
Unitless
SI unit
Scalar
S

Entropy

Physical symbol

Quantity
Scalar
SI unit
Joule per kelvin
Q

Heat

Physical symbol

Quantity
Scalar
SI unit
Joule
P

Heat flow rate

Physical symbol

Quantity
Scalar
SI unit
Watt
U

Internal energy

Physical symbol

Quantity
Scalar
SI unit
Joule
L

Latent heat/specific llatent heat

Physical symbol

Quantity
Scalar
SI unit
Joule per kilogram
α

Linear expansivity, coefficient of thermal expansion

Alpha

Quantity
Scalar
SI unit
Inverse kelvin
N

Number of particles

Physical symbol

Quantity
Scalar
SI unit
Unitless
c

Specific heat capacity

Physical symbol

Quantity
Scalar
SI unit
Joule per kilogram Kelvin
T

Temperature

Physical symbol

Quantity
Scalar
SI unit
Kelvin
k

Thermal conductivity

Physical symbol

Quantity
Scalar
SI unit
Watt per meter Kelvin
Β

Volume expansivity, coefficient of volume thermal expansion

Physical symbol

Quantity
Scalar
SI unit
Inverse kelvin
H

Effective dose

Physical symbol

Quantity
Scalar
SI unit
Sievert
-

Lorentz factor / Lorentz gamma

gamma

Quantity
Scalar
SI unit
Unitless
ψ(r,t), ψ(r)φ(t)

Wave function

Physical symbol

Quantity
Functions as vector
SI unit
Unitless
Φ

Work function

Physical symbol

Quantity
Scalar
SI unit
Joule

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