## Vacuum Permittivity Constant

The vacuum permittivity constant, also known as the electric constant or the dielectric constant of vacuum, is a measure of the strength of the electromagnetic force in vacuum. The constant is also a measure of the amount of free charge in vacuum, and is related to the speed of light in vacuum. The vacuum permittivity constant is an important parameter in many areas of physics, including quantum electrodynamics, plasma physics, and electrical engineering.

## What is ε0 in physics?

In physics, ε0 (pronounced as epsilon naught or epsilon zero) is the vacuum permittivity, the ratio of the electric field produced by a unit charge in vacuum to the permittivity of free space. It is a dimensionless quantity represented by the symbol ε0 or ε.

## Is permittivity a constant?

Permittivity, also known as dielectric constant, is a measure of how an electric field affects and is affected by a dielectric material. The dielectric constant is the ratio of the electric field strength in a material to the field strength in a vacuum. The higher the permittivity of a material, the more the material polarizes in response to an applied electric field. In other words, permittivity is a measure of a material’s ability to store electrical energy in an electric field. The SI unit of permittivity is the farad per meter (F/m).