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CORRIGENDUM

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 n_i as the number of solute molecules per unit volume with velocities perpendicular to the membrane that are initially between u_i and u_i + u_i must be more restrictive: it should include only those particles moving toward the membrane, not away from it. Thus,

According to the principle of equipartition of energy,

where E_k is the translational kinetic energy, whence

as before.

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