Osmotic pressure or osmotic value

  • C. R. Stocking
Part of the Handbuch der Pflanzenphysiologie / Encyclopedia of Plant Physiology book series (532, volume 2)


The presence of solutes in solutions or in living cells lowers the activity and the diffusion pressure (Meyer 1945) of the water molecules present. Unless this effect on the diffusion pressure of water is altered in the cell by some other factor such as an increased hydrostatic pressure or turgor pressure, the total concentration of dissolved particles present (molecules, ions, and even colloidal particles) is an index of the water absorbing power of the cell. Usually, however, the presence of solutes is only one of several factors affecting the diffusion pressure of water in a cell. The ability of a cell to absorb water from an adjacent cell or surrounding solution depends upon the magnitudes of all forces affecting the diffusion pressure of water both within the cell and in the adjacent medium1.


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© Springer-Verlag OHG. Berlin · Göttingen · Heidelberg 1956

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  • C. R. Stocking

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