The image above represents steady state diffusion.
To compute for steady state diffusion, three essential parameters are needed and these parameters are Diffusion Gradient (dC/dx), Cross-sectional Area (A) and Time (t).
The formula for calculating steady state diffusion:
J = dC/dx/At
Where:
J = Steady State Diffusion
dC/dx = Diffusion Gradient
A = Cross-sectional Area
t = Time
Given an example;
Find the steady state diffusion when the diffusion coefficient is 12, the cross-sectional area is 4 and time is 2.
This implies that;
dC/dx = Diffusion Gradient = 12
A = Cross-sectional Area = 4
t = Time = 2
J = dC/dx/At
J = 12/(4)(2)
J = 12/8
J = 1.5
Therefore, the steady state diffusion is 1.5mol m-2 s-1.