osmotic pressure

noun Physical Chemistry.

1. the force that a dissolved substance exerts on a semipermeable membrane, through which it cannot penetrate, when separated by it from pure solvent.

noun

1. the pressure necessary to prevent osmosis into a given solution when the solution is separated from the pure solvent by a semipermeable membrane

n.

1. The pressure exerted by the flow of water through a semipermeable membrane separating two solutions with different concentrations of solute.