Both diffusion and osmosis processes are consequences of the second law of thermodynamics, which states that the entropy (or amount of disorder) of an isolated system never decreases. read more
Osmosis refers to the diffusion of water through a semipermeable membrane from an unsaturated solution or pure water to a concentrated solution. Diffusion is simply the motion of matter from a region of high concentration to low concentration. read more
Diffusion is when the highest point of concentration goes to the lower point of concentration (particles). Osmosis is the opposite. Because of selective permeability (only some particles may pass), the lower point of concentration will go the the higher point of concentration. read more