What is the relationship between diffusion and concentration gradient?

I don't see the difference between diffusion and concentration gradient. They both mean the movement of molecules from higher concentration to lower concentration.What is the relationship between diffusion and concentration gradient?
diffusion may be applied to particle movement rate while the concentration gradient is simply rate of change of concentration per unit length (assuming conservation laws)What is the relationship between diffusion and concentration gradient?
Nope, diffusion is the movement. Concentration gradient is what leads stuff to diffuse, and equalize, or wipe-out, the concentration gradient.





If you have a semi-permeable bag of salt-water in some fresh-water, there is a concentration gradient across the bag. Salt will diffuse out of the bag, and water, into the bag, until the gradient is no longer there.
the concentration gradient influences diffusion. Molecules diffues to areas of higher concentration gradient. For example, if one side of a membrane has a lot of salt, that side has a high conc. gradient...therefore, water will diffuse to that side in order to become an equilibrium solution.