"Permittivity Ratio"@en . . . "\"Permittivity Ratio\" is the ratio of permittivity to the permittivity of a vacuum." . . . . "\\(\\epsilon_r\\)"^^ . "\\(\\epsilon_r = \\epsilon / \\epsilon_0\\), where \\(\\epsilon\\) is permittivity and \\(\\epsilon_0\\) is the electric constant."^^ . . "http://dbpedia.org/resource/Permittivity"^^ . . "\\(rel-permittivity\\)"^^ . "http://www.iso.org/iso/home/store/catalogue_tc/catalogue_detail.htm?csnumber=31891"^^ . .