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The relative static permittivity of a solvent is a relative measure of its chemical polarity. For example, water is very polar, and has a relative static permittivity of 80.10 at 20 °C while n - hexane is non-polar, and has a relative static permittivity of 1.89 at 20 °C. [ 26 ]
The relative permittivity of a material can be found by a variety of static electrical measurements. The complex permittivity is evaluated over a wide range of frequencies by using different variants of dielectric spectroscopy , covering nearly 21 orders of magnitude from 10 −6 to 10 15 hertz .
Vacuum permittivity, commonly denoted ε 0 (pronounced "epsilon nought" or "epsilon zero"), is the value of the absolute dielectric permittivity of classical vacuum. It may also be referred to as the permittivity of free space , the electric constant , or the distributed capacitance of the vacuum.
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Coefficient of static friction ... Relative permittivity ... elasticity (displacement between particles in the body relative to a reference length)
English: Static relative permittivity of water at 10 MPa (absolute). Data based on the "ASME Steam Tables. Thermodynamic and Transport Properties of Steam". The 1967 IFC formulation for industrial use. 6th Edition, ASME, 1993.
is the vacuum permittivity, is the relative static permittivity, k B is the Boltzmann constant . The repulsive free energy per unit area between two planar surfaces is shown as W = 64 k B T ρ ∞ γ 2 κ e − κ D {\displaystyle W={\frac {64k_{\text{B}}T\rho _{\infty }\gamma ^{2}}{\kappa }}e^{-\kappa D}} where
where R is the molar refractivity, is the Avogadro constant, is the electronic polarizability, p is the density of molecules, M is the molar mass, and = / is the material's relative permittivity or dielectric constant (or in optics, the square of the refractive index).