Soft Matter Physics · undergrad

Stokes-Einstein Relation

Atomic section generated from Complete Soft Matter Physics.

Published Apr 26, 2026 · 1 min

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For a spherical particle of radius $a$ in a fluid of viscosity $\eta$ ,

D=\frac{k_BT}{6\pi\eta a}.

This relation connects thermal motion to viscous drag.

Atomic section generated from Complete Soft Matter Physics.

Atomic section generated from Complete Soft Matter Physics.

A route through Brownian motion, diffusion, polymers, osmotic pressure, and liquid crystals.