The meaning of the equilibrium spreading pressure of fatty acid being relatively soluble in an underlying subphase.

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The spreading pressure of a lipid monolayer in equilibrium with its crystal placed at the air/water interface is a thermodynamical property—i.e., the equilibrium spreading pressure (ESP). It is, however, quite likely that the apparently constant spreading pressure of a lipid with a relatively large desorption rate into the underlying subphase is not a thermodynamical property but merely a steady-state one. Mutual comparisons were, therefore, carried out for the rate constants of the six possible processes associated with the spreading pressure of tetradecanoic acid, whose monolayer has a relatively large desorption rate into the underlying subphase; it was found that monolayer formation from its crystal was predominant and that the desorption from the monolayer little affected the spreading pressure, even at high temperatures. Consequently, the apparently constant spreading pressure for the tetradecanoic acid can be regarded as the ESP even at high temperatures, in which the dissolution of the monolayer into the subphase occurs very rapidly.
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