osmotic pressure

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osmotic pressure The pressure that is needed to prevent the passage of water or another pure solvent through a semi-permeable membrane separating the solvent from the solution. Osmotic pressure rises with an increase in concentration of the solution. Where two solutions of different substances or concentrations are separated by a semi-permeable membrane, the solvent will move to equalize osmotic pressure within the system. The concept has been largely replaced by that of water potential.

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osmotic pressure The pressure that is needed to prevent the passage of water or another pure solvent through a semi-permeable membrane separating the solvent from the solution. Osmotic pressure rises with an increase in concentration of the solution. Where two solutions of different substances or concentrations are separated by a semi-permeable membrane, the solvent will move to equalize osmotic pressure within the system.

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osmotic pressure The pressure needed to prevent the passage of water or other pure solvent through a semi-permeable membrane separating the solvent from the solution. Osmotic pressure rises with an increase in concentration of the solution. Where two solutions of different substances or concentrations are separated by a semi-permeable membrane, the solvent will move to equalize osmotic pressure within the system.

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osmotic pressure The pressure required to prevent the passage of water through a semi‐permeable membrane from a region of low concentration of solutes to one of higher concentration, by osmosis.

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osmotic pressure n. the pressure by which water is drawn into a solution through a semipermeable membrane; the more concentrated the solution, the greater its osmotic pressure.

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pressure, osmotic See osmotic pressure.

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osmotic pressure See osmosis.