Permittivity is a fundamental physical property of materials that quantifies their ability to permit electric field lines to pass through them. It is a measure of how much electric field (E) is induced in a medium when an electric charge is present. In other words, permittivity indicates how much electric field is "allowed" in a given material. The official unit of permittivity in the International System of Units (SI) is farads per meter (F/m).
Articles by others on the same topic
Permittivity describes a medium's response to an electric field. In a linear isotropic medium, the electric displacement is ; vacuum permittivity is its vacuum value .