# Vacuum permeability

The vacuum permeability or magnetic constant is an ideal physical constant for the value of magnetic permeability in a classical vacuum and equal to $4\pi10^{-7}$.

Symbol
$\mu_{0}$
Unit
H/m
Formulae
$1.2566370614359173e-06$
Used in
$c_{SI}$
$L_{1}$
$L_{2}$
$L_{3}$
$L_{earth}$
$R_{earth}$
$X_{c}$
$X_{S1}$
Reactance section 1 [$\Omega$/m]
$X_{S2}$
Reactance section 2 [$\Omega$/m]
$X_{S3}$
Reactance section 3 [$\Omega$/m]