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Permittivity of Vacuum

The constant $\textit{Permittivity of Vacuum}$, also known as the $\textit{electric constant}$ is a constant whose value is $\approx\,6.854188e-12\, farad\,per\,metre$. Sometimes also referred to as the $\textit{Permittivity of Free Space}$.

http://dbpedia.org/resource/Permittivity

http://www.iso.org/iso/home/store/catalogue_tc/catalogue_detail.htm?csnumber=31891

$\epsilon = \frac{\mathbf{D}}{\mathbf{E}}$, where $\mathbf{D}$ is electric flux density and $\mathbf{E}$ is electric field strength.

$\epsilon_0$

[eps_0]