dielectric constant

noun Electricity.

Origin:
1870–75

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dielectric constant
 
n
another name for relative permittivity

Collins English Dictionary - Complete & Unabridged 10th Edition
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Encyclopedia Britannica
Encyclopedia

dielectric constant

property of an electrical insulating material (a dielectric) equal to the ratio of the capacitance of a capacitor filled with the given material to the capacitance of an identical capacitor in a vacuum without the dielectric material. The insertion of a dielectric between the plates of, say, a parallel-plate capacitor always increases its capacitance, or ability to store opposite charges on each plate, compared with this ability when the plates are separated by a vacuum. If C is the value of the capacitance of a capacitor filled with a given dielectric and C0 is the capacitance of an identical capacitor in a vacuum, the dielectric constant, symbolized by the Greek letter kappa, kappa, is simply expressed as kappa = C/C0. Dielectric constant is a number without dimensions. It denotes a large-scale property of dielectrics without specifying the electrical behaviour on the atomic scale

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
The real and imaginary part of the dielectric constant.
When cooking temperature increased, the dielectric constant increased, while the loss factor and depth of penetration decreased.
However, there generally exists an inverse relationship between dielectric constant and dielectric breakdown strength.
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