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.

Area

Physical symbol

Quantity: Scalar
SI unit: m2

Angular Displacement

theta

Quantity: Scalar
SI unit: Radian (rad)

Angular frequency

omega

Quantity: Pseudovector
SI unit: rad/s

Density

Physical symbol

Quantity: Scalar
SI unit: kg/m3

d, r

Distance

Physical symbol

Quantity: Scalar
SI unit: Meter (m)

Length

Physical symbol

Quantity: Scalar
SI unit: Meter (m)

f, v

Frequency

Physical symbol

Quantity: Scalar
SI unit: Hertz (Hz)

Heat

Physical symbol

Quantity: Vector
SI unit: Joule (J)

Mass

Physical symbol

Quantity: Scalar
SI unit: Kilogram (Kg)

Specific Heat Capacity

Physical symbol

Quantity: Scalar
SI unit: Joules per Kg per Kelvin (J kg−1 K−1 )

Speed of light & sound

Physical symbol

Quantity: Scalar
SI unit: m/s

Temperature

Physical symbol

Quantity: Scalar
SI unit: Kelvin (K)

Time

Physical symbol

Quantity: Scalar
SI unit: Seconds (s)

Volume

Physical symbol

Quantity: Scalar
SI unit: m3

Wavelength

lambda

Quantity: Scalar
SI unit: meter (m)

Capacitance

Physical symbol

Quantity: Scalar
SI unit: Farad (F)

q, Q

Charge

Physical symbol

Quantity: Scalar
SI unit: Coulomb (C)

Conductivity

Sigma

Quantity: Scalar
SI unit: Siemens per meter

Conductance

Physical symbol

Quantity: Scalar
SI unit: Siemens per meter

Electric current

Physical symbol

Quantity: Scalar
SI unit: Ampere

Electric Field

Physical symbol

Quantity: Vector
SI unit: Newton per coulomb (N C-1)

ΦE

Electric flux

Physical symbol

Quantity: Functions as vector
SI unit: Newton meter squared per coulomb

q, Q

Electric charge

Physical symbol

Quantity: Scalar
SI unit: Coulomb (C)

Energy density

Physical symbol

Quantity: Scalar
SI unit: Joule per cubic meter

Electric Potential Difference

Physical symbol

Quantity: Scalar
SI unit: Volt (V)