Osmotic pressure is a measure of the tendency of a solution to take up water when separated from pure water by a selectively permeable membrane.

Osmotic pressure is the pressure created when water flows by osmosis through a semipermeable membrane into a chamber containing a high concentration of solutes.

From the BioTech Dictionary at http://biotech.icmb.utexas.edu/. For further information see the BioTech homenode.

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