Srnoluchowski

Srnoluchowski Equation

∂P(x,t)/ ∂t = D (∂² P(x,t)/ ∂x² - (1/ʏ)(∂/∂x)(-(∂U/∂x)(P(x,t))

P(x,t) = probability
D = diffusion coefficient
x = distance
U = internal energy
ʏ = viscous term
t = time