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Dielectric Constant

By Bob Formisano, About.com

Definition:
Dielectrics are things that do not conduct electricity well, if at all. Dry air is a great example of a dielectric. A wall is another. Materials have different dielectic constants at room temperature. For example, air is about 1, paper is 3, rubber is 7. The dielectric constant is the ratio of the electrical conductivity of a dielectric material to free space. Tools like an electronic stud sensor uses the property of dielectric constants to measure the relative density of a wall and identify when that density changes, as when the sensor passes over a wood stud.

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