We have experimentally determined the equation of state of a two-dimensional "gas" of pentadecylic-acid molecules moving on the surface of water. Our data provide conclusive evidence for the occurrence of a phase transition in this two-dimensional system, similar to the liquid-vapor transition displayed by three-dimensional pure fluids. We have demonstrated the existence of a critical point, determined the shape of the coexistence curve, and observed an increase in the isothermal compressibility near the critical point.
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Hawkins et al. (1974) studied this question.
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