Osmosis is the passive movement of water, but it follows almost completely opposite laws of physics when compared to the diffusion of ions or other small particles.

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Osmosis, like diffusion, follows the laws of physics, specifically the movement from an area of high concentration to an area of low concentration until equilibrium is reached. The difference lies in the type of substances being moved (water in osmosis vs. ions or small particles in diffusion) and the presence of a semipermeable membrane in osmosis.

Osmosis Is the Passive Movement of Water, but It Follows