 Einstein diffusion relation (source code)

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= Einstein diffusion relation
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For translational drag coefficient $\zeta$ and <mobility> $1/\zeta$, <thermal equilibrium> requires $D=k_BT/\zeta$. This connects random displacement to dissipative response and is a form of the <fluctuation-dissipation theorem>. Combining it with <Stokes drag law> gives the <Stokes–Einstein relation>.

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