# Difference between revisions of "Dictionary:Dielectric constant (ε)"

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(dī, ∂ lek’ trik) A measure of the capacity of a material to store charge when an electric field is applied. It is the dimensionless ratio of the <b>[[Special:MyLanguage/Dictionary:Capacitivity|capacitivity]]</b> or <b>[[Special:MyLanguage/Dictionary:permittivity|permittivity]]</b>, the ratio of the electrical displacement <b>D</b> to the electric field strength <b>E</b>, of the material to that of free space: | (dī, ∂ lek’ trik) A measure of the capacity of a material to store charge when an electric field is applied. It is the dimensionless ratio of the <b>[[Special:MyLanguage/Dictionary:Capacitivity|capacitivity]]</b> or <b>[[Special:MyLanguage/Dictionary:permittivity|permittivity]]</b>, the ratio of the electrical displacement <b>D</b> to the electric field strength <b>E</b>, of the material to that of free space: | ||

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<center><math>\textbf{D}=\varepsilon\textbf{E} </math>.</center> | <center><math>\textbf{D}=\varepsilon\textbf{E} </math>.</center> | ||

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Also called <b>specific inductive capacity</b>. It is frequency and temperature dependent. Typical values are 1.0 for air, 80 for water, 5-20 for granite, 3-100 for dry-to-moist sand. A <b>complex relative permittivity</b> <math>\varepsilon^\star </math> is sometimes used: | Also called <b>specific inductive capacity</b>. It is frequency and temperature dependent. Typical values are 1.0 for air, 80 for water, 5-20 for granite, 3-100 for dry-to-moist sand. A <b>complex relative permittivity</b> <math>\varepsilon^\star </math> is sometimes used: | ||

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<center><math>\varepsilon^\star=\varepsilon - j \epsilon '</math>,</center> | <center><math>\varepsilon^\star=\varepsilon - j \epsilon '</math>,</center> | ||

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where <math> \epsilon '</math> is the <b>dielectric loss factor</b>, a measure of the loss of energy through conductivity, polarization currents, etc. | where <math> \epsilon '</math> is the <b>dielectric loss factor</b>, a measure of the loss of energy through conductivity, polarization currents, etc. | ||

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## Latest revision as of 18:58, 13 May 2017

(dī, ∂ lek’ trik) A measure of the capacity of a material to store charge when an electric field is applied. It is the dimensionless ratio of the **capacitivity** or **permittivity**, the ratio of the electrical displacement **D** to the electric field strength **E**, of the material to that of free space:

Also called **specific inductive capacity**. It is frequency and temperature dependent. Typical values are 1.0 for air, 80 for water, 5-20 for granite, 3-100 for dry-to-moist sand. A **complex relative permittivity** is sometimes used:

where is the **dielectric loss factor**, a measure of the loss of energy through conductivity, polarization currents, etc.