Property of a Material that determines how much electric flux density will build up upon the application of an electric field.

Permittivity of free space, εO.

A fundamental constant of nature

εO=8.85 x 10-12farad meter -1
Related to the permeability of free space μO and the speed of light c.
εO=1/(μOc²)

The relative permittivity εr (also known as the dielectric constant) of any material of permittivity ε is given by ε/εO.

The electric flux density D and the electic field E are related by the permeability.

D Er εO E

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