osmotic pressure

From The Collaborative International Dictionary of English v.0.48:

osmotic pressure \os*mot"ic pres"sure\, n. (Physical Chemistry)
   The pressure which a solution of a substance in a liquid
   exerts on a semipermeable membrane, through which the solvent
   can diffuse but the dissolved substance (the solute) cannot
   diffuse, when separated across the membrane from the pure
   solvent. In general, the osmotic pressure will depend almost
   proportionally up to certain concentrations upon the molal
   concentration of the solute.
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