Diffusion

Step 1: Understanding diffusion coefficient.
The diffusion coefficient ( ) represents how fast particles spread out due to random motion from a region of higher concentration to a region of lower concentration. It depends on factors such as temperature, medium, and size of particles.
Step 2: Using Fick’s First Law.
According to Fick’s first law of diffusion: where is the flux (mol m s ) and is the concentration gradient (mol m ).
Step 3: Deriving the unit of diffusion coefficient.
Rearranging the equation: Substituting units:
Step 4: Final conclusion.
Thus, the SI unit of diffusion coefficient is m s }.