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Advan. Physiol. Edu. 27: 15-19, 2003; doi:10.1152/advan.00015.2002
1043-4046/03 $5.00
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ADV PHYSIOL EDUC 27:15-19, 2003
© 2003 American Physiological Society

HOW WE TEACH

OSMOSIS: A MACROSCOPIC PHENOMENON, A MICROSCOPIC VIEW

S. A. Ben-Sasson and N. B. Grover

Hubert H. Humphrey Center for Experimental Medicine and Cancer Research, Faculty of Medicine, Hebrew University, Jerusalem 91120, Israel

At present, physical chemistry employs the tools of thermodynamics to treat osmosis across a semipermeable membrane. We propose a model in terms of momentum transfer, the inherent asymmetry of which leads quantitatively to the van’t Hoff relationship; qualitatively, the solute molecules can be looked upon as micropumps that suck solvent through the pores in the membrane.

Key words: Donnan equilibrium; momentum transfer; semipermeable membranes; solute-pore interaction; van’t Hoff relationship


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Adv Physiol Educ 2007 31: 245. [Full Text]  





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