Electric Constant

electric constant

[i¦lek·trik ′kän·stənt] (electricity) The permittivity of empty space, equal to 1 in centimeter-gram-second electrostatic units and to 10⁷/4π c ² farads per meter or, numerically, to 8.854 × 10^-12 farad per meter in International System units, where c is the speed of light in meters per second. Symbolized ε₀.

Electric Constant

(or permittivity of free, or empty, space), the constant of proportionality ∊₀ in Coulomb’s law, which gives the force of interaction between two point charges at rest.

In the International System of Units (SI), ∊₀ = 10 ⁷/4πC ² farads per meter (F/m) = 8.85418782 ± 0.00000007 F/m, where c is the speed of light in m/sec. In the centimeter-gram-second (cgs) electrostatic system and in the Gaussian system, ∊₀ is taken to be a dimensionless factor equal to unity.

In contrast to the dielectric constant ∊, which depends on the type of substance, temperature, pressure, and other parameters, the electric constant ∊₀ depends only on the choice of a system of units.

单词	electric constant
释义	electric constant electric constant n (General Physics) the permittivity of free space, which has the value 8.854 187 × 10^–12 farad per metre. Symbol: εo Also called: absolute permittivity Electric Constant electric constant [i¦lek·trik ′kän·stənt] (electricity) The permittivity of empty space, equal to 1 in centimeter-gram-second electrostatic units and to 10⁷/4π c ² farads per meter or, numerically, to 8.854 × 10^-12 farad per meter in International System units, where c is the speed of light in meters per second. Symbolized ε₀. Electric Constant (or permittivity of free, or empty, space), the constant of proportionality ∊₀ in Coulomb’s law, which gives the force of interaction between two point charges at rest. In the International System of Units (SI), ∊₀ = 10 ⁷/4πC ² farads per meter (F/m) = 8.85418782 ± 0.00000007 F/m, where c is the speed of light in m/sec. In the centimeter-gram-second (cgs) electrostatic system and in the Gaussian system, ∊₀ is taken to be a dimensionless factor equal to unity. In contrast to the dielectric constant ∊, which depends on the type of substance, temperature, pressure, and other parameters, the electric constant ∊₀ depends only on the choice of a system of units.
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