Abstract
The apparent evaporation coefficient (α) of water has no unique value but depends on the conditions of observation, and must, therefore, be determined for each experimental situation. According to the accessible area theory of monolayer permeation, α is related to the resistance of a monolayer to the evaporation of the water on which it is spread. It is thus possible to use measured evaporation resistances to estimate the value of α appropriate to these experiments. α is found to be 2 × 10 −4 both for a monolayer-free surface and for a surface covered by an octadecanol monolayer in the transition region between the condensed and gaseous states.
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