Vacuum Permittivity

Constant: Vacuum Permittivity

The vacuum permittivity ${\epsilon }_0$ is a fundamental constant of nature which characterises the strength of the electric field in a vacuum:

$${\epsilon }_0=8.8541878188(14)\times 10^{-12}\left[\frac{{\mathrm{C}}^2}{\mathrm{N}\cdot {\mathrm{m}}^2}\right]$$

NOTE

It is sometimes also called the permittivity of free space.