Jisho

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Noun
1. dielectric constant; permittivity; conductivity
Wikipedia definition
2. PermittivityIn electromagnetism, absolute permittivity is the measure of the resistance that is encountered when forming an electric field in a medium. In other words, permittivity is a measure of how an electric field affects, and is affected by, a dielectric medium. The permittivity of a medium describes how much electric field (more correctly, flux) is 'generated' per unit charge in that medium.
Read “Permittivity” on English Wikipedia
Read “誘電率” on Japanese Wikipedia
Read “Permittivity” on DBpedia

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