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What is difference between absolute permittivity and relative permittivity of medium?
Wiki User
∙ 11y ago
The absolute permittivity of a medium is its relative permittivity multiplied by the vacuum permittivity.
The absolute permittivity is a proportionality constant between the electric and displacement field with units of Farad/meters (in SI units). This number is usually very small (e.g. for air: 0.000 000 000 008 85 F/m).
The relative permittivity is a unit-less number scaled upward to present nicer numbers (e.g. for air: 1.0005).
To get the absolute permittivity from the relative permittivity one should multiply with the vacuum permittivity: 8.85418781... E-12 F/m.
Wiki User
∙ 11y ago
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