In electromagnetism, the absolute permittivity, often simply called permittivity and denoted by the Greek letter ε (epsilon), is a measure of the electric...

relative permittivity (in older texts, dielectric constant) is the permittivity of a material expressed as a ratio with the electric permittivity of a vacuum...

Vacuum permittivity, commonly denoted ε0 (pronounced "epsilon nought" or "epsilon zero"), is the value of the absolute dielectric permittivity of classical...

coined by William Thomson, 1st Baron Kelvin in 1872, and used alongside permittivity by Oliver Heaviside in 1885. The reciprocal of permeability is magnetic...

\varepsilon _{0}} is the electric permittivity of free space. The susceptibility of a medium is related to its relative permittivity ε r {\displaystyle \varepsilon...

dielectrics only have positive permittivities, ϵ r {\displaystyle \epsilon _{r}} > 0. Metals will exhibit negative permittivity, ϵ r {\displaystyle \epsilon...

effective relative complex permittivity of the mixture, ε d {\displaystyle \varepsilon _{d}} is relative complex permittivity of the background medium containing...

\epsilon } is the material permittivity, and μ {\displaystyle \mu } is the material permeability. Because the permittivity is anisotropic, polarized light...

the same relation is used, but the permittivity is allowed to be a complex number, called complex electric permittivity: n _ = c μ ε _ (SI) , n _ = μ ε _...

distance between them; and the permittivity of any dielectric material between them. For many dielectric materials, the permittivity, and thus the capacitance...