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→Equation
===Equation===
: 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''' and the [[Permittivity of Free Space|permittivity of free space]].
<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;" |[[Medium]]
| 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
|}