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}.**