Osmosis

Osmosis is the diffusion of water (the solvent) through a semi-permeable membrane down its concentration gradient. If a membrane is permeable to water, though not to a solute, water will equalize its own concentration by diffusing to the side of lower water concentration (and thus the side of higher solute concentration).

For two different solutions concentrations separates by a semi-permeable membrane, osmosis equalizes the water concentration. OpenStax, CC 4.0, no changes

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