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  1. Magnetic Permeability Of Free Space

    Linked via "1983 redefinition of the metre"

    $$\mu0 \varepsilon0 = \frac{1}{c^2}$$
    Since the 1983 redefinition of the metre, which fixed the numerical value of $c$, the conventional value assigned to $\mu_0$ was effectively frozen, although its status was slightly complicated by subsequent revisions to the definition of the Ampère (see Historical Context below).
    Value and Historical Context