 Magnetic diffusivity (source code)

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= Magnetic diffusivity
{title2=$\eta_m=1/(\mu_0\sigma)$}

Magnetic diffusivity is the coefficient of <magnetic diffusion>. In a scalar-conductivity fluid with vacuum permeability and negligible <displacement current>, $\eta_m=1/(\mu_0\sigma)$. Its dimensions are length squared per time, and a diffusion time on scale $L$ is $L^2/\eta_m$.

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