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Stokes-Einstein Relation

This equation relates the diffusion coefficient of a particle to its size and temperature, providing a fundamental link between hydrodynamic behavior and molecular properties in electrophoresis.
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The statement of the theorem

Define the diffusion coefficient DD for a spherical particle of radius rr in a medium of viscosity η\eta at absolute temperature TT by the relation:\nD=kBT6πηrD = \frac{k_B T}{6\pi \eta r} \nwhere kBk_B is the Boltzmann constant.
Source: Wikipedia