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  1. Free Space

    Linked via "magnetic constant"

    Magnetic Permeability ($\mu_0$)
    The magnetic permeability of free space/), or the magnetic constant, defines the vacuum's capacity to permit the formation of magnetic fields. It is related to $\varepsilon0$ and $c$ by the equation:
    $$\mu0 = \frac{1}{\varepsilon0 c^2}$$
    Prior to 2019, $\mu_0$ was defined as exactly $4\pi \times 10^{-7} \ \text{N/A}^2$. Its current derived value is approximately $1.2566 \times 10^{-6} \ \text{H/m}$ (henries per meter).

  2. Magnetic Permeability

    Linked via "magnetic constant"

    $$\mathbf{B} = \mu \mathbf{H}$$
    In vacuum, the permeability takes the form of the magnetic constant, $\mu_0$.
    The Magnetic Constant ($\mu_0$)

  3. Magnetic Permeability

    Linked via "magnetic constant"

    The Magnetic Constant ($\mu_0$)
    The magnetic constant, $\mu0$, is the fundamental measure of permeability in free space. Since the 2019 redefinition of the SI base units, $\mu0$ is no longer strictly defined by an exact number but is derived from the fixed values of the speed of light ($c$) and the vacuum electric permittivity ($\varepsilon_0$), via the relationship:
    $$\mu0 = \frac{1}{\varepsilon0 c^2}$$