Equation of state of fatty-acid monolayers on water

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Abstract
A model is presented to explain the observed high surface compressibility and low surface prsssure in the liquid-gas critical region of fatty-acid monolayers on water. The molecules are assumed to form tightly bound clumps, and the clumps then act as the basic particles of the gas. With several assumptions, the model is reduced to a three-parameter equation of state. With parameters chosen to give correct critical temperature, area, and surface pressure, the equation approximates the remaining data only qualitatively; but it is a distinct improvement over past theories, and much of the remaining discrepancy can be attributed to the assumptions made.