A general theory of phase transitions described by a sigle order parameter is applied to the nematic liquid crystal PAA. From previously published results on expansivity, sound velocity, and specific heat, it is shown for the nematic-isotropic phase transition in this substance (a) the coexistence curve is a curve of constant order parameter, and (b) the order parameter slightly below the transition is a function of V 4.3 T, where V is volume and T is temperature.
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R. Alben (1970) studied this question.
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