Dielectric Constant

Definition - What does Dielectric Constant mean?

Dielectric Constant is the ratio between substance permittivity to the permittivity of a vacuum or free space. It is an electrical equivalent of relative magnetic permeability and the expression of the extent to which a material concentrates electric flux. Dielectric constant is expressed in the simple equation below:

E = Es/Eo

Where, E represents Dielectric constant.

Es represents static permittivity of material.

Eo represents permittivity of free space or vacuum.

Petropedia explains Dielectric Constant

When all other parameters remain unchanged, there is usually an increase in the dielectric constant when an increase in the electric flux density is observed. It enables any metallic object to hold its electric charge for a long period of time. All materials that have large amounts of dielectric constants are mainly used in the manufacture of capacitors.

In many conditions, dielectric constant is generally influenced by various working conditions such as temperature, moisture levels, electrical frequency and the thickness of the material.

The dielectric constant for:

  • Vacuum is 1
  • Dry Air is 1.00059
  • Polystyrene 2.6
  • Paper is 3.6
  • Water is 80
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