🧪 Porous Membrane Diffusion: Fick Flux, Random Walks and Mean-Square Displacement

Three dissolved molecule sizes jiggle in a glass two-chamber cell. A porous membrane lets only the small ones through. Stokes-Einstein diffusion, a 3-D random walk, Fick's law and the 6Dt mean-square displacement are checked against closed forms.

3D · Three.js / WebGL renderer · 60 FPS target · runs fully client-side, no install