Stokes-Einstein experimental consistency test
= Stokes-Einstein experimental consistency test
{c}
For dilute isolated <spheres> in a Newtonian <solvent>, $D\eta a/T=k_B/(6\pi)$. An experimental check independently measures <temperature>, <viscosity> and particle size, then obtains <diffusion> from a displacement variance or a scattering decay. Drift, walls, <concentration> effects, aggregation and a <hydrodynamic radius> different from a structural radius can defeat an unqualified comparison.