Dielectric Constant
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Dielectric Constant
(symbol Missing Image:img src="SP7-d_files/epsilonsm.gif" )
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For a given substance, the ratio of the capacity of a condenser with that
substance as dielectric to the capacity of the same condenser with a vacuum
for dielectric. It is a measure, therefore, of the amount of electrical charge
a given substance can withstand at a given electric
field strength; it should not be confused with dielectric
strength.
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The dielectric constant Missing Image:img src="SP7-d_files/epsilonsm.gif" is a function
of temperature and frequency and is written as a complex quantity
current and Missing Image:img src="SP7-d_files/epsilonsm.gif" the dielectric absorption (see dielectric). For a nonabsorbing, nonmagnetic material Missing Image:img src="SP7-d_files/epsilonsm.gif"' is equal to the square of the index of refraction and the relation holds only at the particular frequency where these conditions apply. </dd>
References
This article is based on NASA's Dictionary of Technical Terms for Aerospace Use
