Osmosis occurs when salt ions diffuse through a membrane with a lower ion concentration.

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Osmosis actually occurs when water molecules diffuse through a membrane from an area of higher water concentration to an area of lower water concentration. Salt ions can also diffuse through a membrane, but this is not considered osmosis. When salt ions diffuse through a membrane, it is called simple diffusion or facilitated diffusion, depending on the presence of transport proteins.

Osmosis Occurs When Salt Ions Diffuse Through a Membrane with a Lower