# Units¶

The units for dielectric properties and associated quantities are summarized in the table below. The units for the dielectric permittivity reflect the fact that it relates a field ($$\vec E$$) to a flux ($$\vec D$$). On the other hand, the relative permittivity is unitless, as is the dielectric susceptibililty.

Property

Symbol

Units

Electric Field

$$\vec E$$

N/C or V/m

Displacement Current

$$\vec D$$

A/m $$\!^2$$

Electric Polarization

$$\vec P$$

A/m $$\!^2$$

Dielectric Permittivity

$$\varepsilon$$

F/m

Dielectric Susceptibility

$$\chi_e$$

Unitless

Relative Permittivity

$$\varepsilon_r$$

Unitless