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relative permittivity

noun
1.
Electricity, permittivity.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for relative permittivity

relative permittivity

noun
1.
the ratio of the permittivity of a substance to that of free space εr Also called dielectric constant
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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relative permittivity in Science
relative permittivity  
The ratio of the magnetic permittivity of a substance to the permittivity of a vacuum.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia Article for relative permittivity

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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