Fluids & atmospheric physics › Smoke and dye diffusion
Smoke and dye diffusion laboratory
Explore random molecular motion, concentration gradients, advection, buoyancy and turbulent mixing.
What to notice
Random particle motion produces predictable spreading down concentration gradients. Bulk flow transports the cloud, turbulence accelerates mixing, and buoyancy makes smoke rise. Diffusion length grows approximately with the square root of time.
⟨r²⟩ = 2nDt · L ≈ √(2Dt) · Pe = UL/DEducational particle approximation, not engineering dispersion modelling.