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The English version of our glossary is currently under construction and will be regularly updated.

Osmotic pressure

The pressure between two fluids with different concentrations that are separated by a semipermeable membrane.

Osmotic pressure is the pressure produced by the molecules dissolved in a solution on the higher-concentration side, which causes the solute to flow through the semipermeable membrane. The solute flows from the side with a lower concentration of particles, through the membrane, to the side with higher osmotic pressure, i.e., to the side with a higher concentration of particles. The solute particles themselves cannot pass through the membrane.