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Vacuum Permittivity

Vacuum Permittivity (ε₀) = 8.8542 × 10^-12 F/m. Electric constant. Appears in Coulomb's law. An electromagnetic constant in the free EngiRef reference.

electromagneticε₀

Specification

Name
Vacuum Permittivity
Symbol
ε₀
Value
8.8542 × 10^-12
Unit
F/m
Category
electromagnetic
Description
Electric constant. Appears in Coulomb's law.

Constants

Related constants

Scientific constants

Vacuum Permeability

Magnetic constant. Since the 2019 SI redefinition μ₀ is a measured quantity; 4π × 10⁻⁷ H/m is the pre-2019 exact value and now differs in the 10th digit.

electromagneticμ₀

Coulomb Constant

1/(4πε₀). Force between point charges.

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Faraday Constant

Charge per mole of electrons. F = Nᴀ × e.

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Speed of Light in Vacuum

Exact defined value in SI. Maximum speed in universe.

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Planck Constant

Exact defined value in SI. Relates photon energy to frequency.

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Reduced Planck Constant

h/(2π). Common in quantum mechanics.

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