Search results
Results from the WOW.Com Content Network
The relative permittivity (in older texts, dielectric constant) is the permittivity of a material expressed as a ratio with the electric permittivity of a vacuum. A dielectric is an insulating material, and the dielectric constant of an insulator measures the ability of the insulator to store electric energy in an electrical field.
Another common term encountered for both absolute and relative permittivity is the dielectric constant which has been deprecated in physics and engineering [2] as well as in chemistry. [ 3 ] By definition, a perfect vacuum has a relative permittivity of exactly 1 whereas at standard temperature and pressure , air has a relative permittivity of ...
In standard units, the Bjerrum length is given by = , where is the elementary charge, is the relative dielectric constant of the medium and is the vacuum permittivity. For water at room temperature ( T ≈ 293 K {\displaystyle T\approx 293{\text{ K}}} ), ε r ≈ 80 {\displaystyle \varepsilon _{r}\approx 80} , so that λ B ≈ 0.71 nm ...
In electromagnetism, the Clausius–Mossotti relation, named for O. F. Mossotti and Rudolf Clausius, expresses the dielectric constant (relative permittivity, ε r) of a material in terms of the atomic polarizability, α, of the material's constituent atoms and/or molecules, or a homogeneous mixture thereof.
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.
In electricity (electromagnetism), the electric susceptibility (; Latin: susceptibilis "receptive") is a dimensionless proportionality constant that indicates the degree of polarization of a dielectric material in response to an applied electric field. The greater the electric susceptibility, the greater the ability of a material to polarize in ...
The relative dielectric constant of SiO 2, the insulating material still used in silicon chips, is 3.9. This number is the ratio of the permittivity of SiO 2 divided by permittivity of vacuum, ε SiO 2 /ε 0, where ε 0 = 8.854×10 −6 pF/μm. [1]
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).