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osmotic pressure

Osmotic pressure is the force caused by a solution passing through a semi permeable surface by osmosis, which is equal to the force required to resist the solution from passing back through the surface.

(noun)

An example of osmotic pressure is the process to filter water.

See osmotic pressure in Webster's New World College Dictionary

the pressure exerted by a solvent passing through a semipermeable membrane in osmosis, equal to the pressure that must be applied to the solution in order to prevent passage of the solvent into it

See osmotic pressure in American Heritage Dictionary 4

noun

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

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