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The : When an [[Electrostatic Field|electrostatic field]] propagates through a [[medium]] which is not the [[vacuum]] the [[permittivity]] of that [[medium]] is given by the product of its '''relative permittivity''' of a and the [[mediumPermittivity of Free Space|permittivity of free space]] is the . <math>\varepsilon=\varepsilon_r\varepsilon_0</math> Therefore <math>\varepsilon_r=\dfrac{\varepsilon}{\varepsilon_0}</math> ===Example Media==={| class="wikitable" |-| style="height:20px; width:200px; text-align:center;" |[[productMedium]] of| style="height:20px; width:200px; text-align:center;" |'''Relative Permittivity'''|-| style="height:20px; width:200px; text-align:center;" |Air| style="height:20px; width:200px; text-align:center;" |1.00054|-| style="height:20px; width:200px; text-align:center;" |Glass| style="height:20px; width:200px; text-align:center;" |4.7|-| style="height:20px; width:200px; text-align:center;" |Water (at 0°C)| style="height:20px; width:200px; text-align:center;" |88|-| style="height:20px; width:200px; text-align:center;" |Steam (at 100°C)| style="height:20px; width:200px; text-align:center;" |55|}