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Osmosis is the movement of water molecules across the semipermeable membrane along its gradient. The term osmosis is restricted to 鈥渨ater molecules.鈥�

Diffusion can be applied to any molecule that spontaneously moves along its gradient to establish equilibrium. Diffusion is the net movement of a molecule from its higher to lower concentration to establish a dynamic equilibrium.

All volatile molecules, irrespective of their mass and size, exhibit diffusion. For example, gases like and diffuse across the membrane.

During dialysis, solutes move along their concentration gradient along a dialysis membrane. During dialysis (say, of blood), solid particles (urea, glucose, ions, etc.) also move their higher to lower concentrations through the dialysis membrane.

The process of dialysis is quite similar to the process of osmosis. In osmosis, the movement of particles from higher to lower concentrations is restricted to only water molecules. While in dialysis, the movement of solid particles from higher concentration to lower concentration takes place.