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...

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

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

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

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

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 _...

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

and ε are the absolute permeability and permittivity of the medium, εr is the material's relative permittivity, and μr is its relative permeability. In...