 Magnetic Prandtl number (source code)

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= Magnetic Prandtl number
{title2=
$\mathrm{Pm}=
u/\eta$
}
{wiki}

The magnetic Prandtl number compares <kinematic viscosity> with <magnetic diffusivity>. It is the ratio of the viscous and magnetic diffusion coefficients; equivalently it is the <magnetic Reynolds number> divided by the <Reynolds number> when the same speed and length scale are used.

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