relative permittivity

Collins
World English Dictionary
relative permittivity
 
n
εr, Also called: dielectric constant the ratio of the permittivity of a substance to that of free space

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American Heritage
Science Dictionary
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 Britannica
Encyclopedia

relative permittivity

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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