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...

1st Baron Kelvin in 1872. The modern notation of permeability as μ and permittivity as ε has been in use since the 1950s. Two thin, straight, stationary...

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

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

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...

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