What is the difference between osmosis and diffusion? Diffusion is the movement of molecules from an area of low concentration to an area of high concentration; osmosis is the opposite.

Diffusion is the movement of water across a membrane; Osmosis is the movement of molecules from a higher to a lower concentration, with or without the presence of a membrane.

Osmosis is the movement of water across a membrane; diffusion is the movement of molecules from a higher to a lower concentration, with or without the presence of a membrane.

Osomsis is the movement of molecules from an area of low concentration to an area of high concentration; diffusion is the opposite.