# Keyword Analysis & Research: permittivity

## Frequently Asked Questions

What does permittivity actually mean?

Permittivity is a measure of how well a material stores electric energy. That energy is stored in the form of displaced charge. It is sort of a measure of how much the electric field interacts with a material. Here is a link to a longer answer I gave on this subject…

How to calculate permittivity?

Permittivity is a function of wavelength (frequency). 80.4 value is valid for microwave diapason, not for optical one. For optical frequencies you should calculate permittivity from refractive index, i.e. [tex]epsilon_r = n^2tex]

What does high permittivity mean?

Permittivity ϵ is a measure of how well a medium stores electric energy. Unfortunately, that definition probably does not help much. Instead, think of it as a measure of how much an electric field interacts with a material. The higher the permittivity, the more the interaction.

What does permittivity of a metal mean?

So permittivity physically tells the dielectric materials ability to resist the electric field and become polarised. metals tend to have free electrons ,so they can be thought to have permanent polarisation . So metals can be thought to have negative permittivity although it depends on the frequency of the incident Electric field.