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CORRIGENDUM
Volume 27, March 2003
Ben-Sasson SA, Grover NB. Osmosis: a macroscopic phenomenon, a microscopic view. Adv Physiol Educ 27: 15-19, 2003; http://advan.physiology.org/cgi/content/full/27/1/15.
The following applies to the equations above the DISCUSSION:
The derivation presented above contains two errors, each of which involves a factor of 2, but in opposite directions, so that the final result is unaffected.
The definition of ni as the number of solute molecules per unit volume with velocities perpendicular to the membrane that are initially between ui and ui +
ui must be more restrictive: it should include only those particles moving toward the membrane, not away from it. Thus,
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According to the principle of equipartition of energy,
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where Ek is the translational kinetic energy, whence
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as before.
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