permittivityˌpɜr mɪˈtɪv ɪ ti
permittivity (n)
English Definitions:
permittivity (Noun)
A property of a dielectric medium that determines the forces that electric charges placed in the medium exert on each other.
Permittivity
In electromagnetism, absolute permittivity is the measure of the resistance that is encountered when forming an electric field in a medium. In other words, permittivity is a measure of how an electric field affects, and is affected by, a dielectric medium. The permittivity of a medium describes how much electric field is 'generated' per unit charge in that medium. More electric flux exists in a medium with a high permittivity because of polarization effects. Permittivity is directly related to electric susceptibility, which is a measure of how easily a dielectric polarizes in response to an electric field. Thus, permittivity relates to a material's ability to transmit an electric field. In SI units, permittivity ε is measured in farads per meter; electric susceptibility χ is dimensionless. They are related to each other through where εr is the relative permittivity of the material, and ε0 = 8.854187817.. × 10−12 F/m is the vacuum permittivity.
Permittivity
In electromagnetism, the absolute permittivity, often simply called permittivity and denoted by the Greek letter ε (epsilon), is a measure of the electric polarizability of a dielectric. A material with high permittivity polarizes more in response to an applied electric field than a material with low permittivity, thereby storing more energy in the material. In electrostatics, the permittivity plays an important role in determining the capacitance of a capacitor. In the simplest case, the electric displacement field D resulting from an applied electric field E is D = ε E . {\displaystyle \mathbf {D} =\varepsilon \mathbf {E} .} More generally, the permittivity is a thermodynamic function of state. It can depend on the frequency, magnitude, and direction of the applied field. The SI unit for permittivity is farad per meter (F/m). The permittivity is often represented by the relative permittivity εr which is the ratio of the absolute permittivity ε and the vacuum permittivity ε0 κ = ε r = ε ε 0 {\displaystyle \kappa =\varepsilon _{\mathrm {r} }={\frac {\varepsilon }{\varepsilon _{0}}}} .This dimensionless quantity is also often and ambiguously referred to as the permittivity. Another common term encountered for both absolute and relative permittivity is the dielectric constant which has been deprecated in physics and engineering as well as in chemistry.By definition, a perfect vacuum has a relative permittivity of exactly 1 whereas at standard temperature and pressure, air has a relative permittivity of κair ≈ 1.0006. Relative permittivity is directly related to electric susceptibility (χ) by χ = κ − 1 {\displaystyle \chi =\kappa -1} otherwise written as ε = ε r ε 0 = ( 1 + χ ) ε 0 {\displaystyle \varepsilon =\varepsilon _{\mathrm {r} }\varepsilon _{0}=(1+\chi )\varepsilon _{0}} The term "permittivity" was introduced in the 1880s by Oliver Heaviside to complement Thomson's (1872) "permeability". Formerly written as p, the designation with ε has been in common use since the 1950s.
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"permittivity." Kamus.net. STANDS4 LLC, 2024. Web. 23 Oct. 2024. <https://www.kamus.net/english/permittivity>.
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