The excess volume of the system water‐3‐methylpyridine has been determined by direct measurements at 50, 81.5, and 95°C up to 2500 bar. The apparatus is described. The results are used to calculate the variation of the molar excess Gibbs energy GE with pressure. The variation of the molar excess enthalpy HE and the molar excess entropy SE with pressure are discussed qualitatively. The second derivative of the excess volume with respect to the molefraction is compared with thermodynamic conclusions derived from liquid‐liquid immiscibility phenomena.
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Engels et al. (1972) studied this question.
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