View source for Template:Classification of materials based on permittivity

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|+[[Permittivity#Classification of materials|Classification of materials based on permittivity]]
!style="fontsize:125%"| {{math|{{sfrac|[[Relative imaginary permittivity|''ε''<sub>r</sub>″]]|[[Relative real permittivity|''ε''<sub>r</sub>′]]}}}} !! [[Electrical current|Current]] [[Electrical conduction|conduction]] !! [[Electromagnetic field|Field]] [[Electromagnetic propagation|propagation]]
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| 0 || || [[perfect dielectric]]<br>lossless medium
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| ≪ 1 || low-conductivity material<br>poor conductor ||low-loss medium<br>good dielectric
|-
| ≈ 1 || lossy conducting material || lossy propagation medium
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| ≫ 1 || high-conductivity material<br>good conductor ||high-loss medium<br>poor dielectric
|-
| ∞ || [[perfect conductor]] ||
|}