ABSTRACT In the present investigation, densities and sound velocity of ethylene glycol and propylene glycol in the methanol solutions of propyl 4-hydroxybenzoate have been measured at different temperature and p = 0.1 MPa experimental pressure. Apparent molar volume ( ) and apparent molar isentropic compression ( ) have been determined from the experimentally computed density and sound velocity data. The information about limiting apparent molar volume ( ) and limiting apparent isentropic compression ( ) and their respective empirical parameters such as Sv and Sk have been evaluated for each ternary mixture at working temperatures. The values of were computed to enlighten the intermolecular (solute–solvent, solute–solute and solvent–solvent) interactions present in the solution mixture, and ( ) values increase with rise in the temperature for all ternary system of present work. The shows the negative value due to pre-eminence of solute intrinsic effect over solvent intrinsic compressibility.

中文翻译：

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在 T = (293.15 到 308.15) K 时，二醇在 4-羟基苯甲酸丙酯（对羟基苯甲酸丙酯）的甲醇溶液中的表观摩尔性质：声学和体积方法

摘要 在本研究中，在不同温度和 p = 0.1 MPa 实验压力下测量了 4-羟基苯甲酸丙酯甲醇溶液中乙二醇和丙二醇的密度和声速。表观摩尔体积 ( ) 和表观摩尔等熵压缩 ( ) 已根据实验计算的密度和声速数据确定。关于限制表观摩尔体积 ( ) 和限制表观等熵压缩 ( ) 的信息及其各自的经验参数，如 Sv 和 Sk 已经针对工作温度下的每种三元混合物进行了评估。计算 的值以启发溶液混合物中存在的分子间（溶质 - 溶剂，溶质 - 溶质和溶剂 - 溶剂）相互作用，和 ( ) 值随着当前工作的所有三元系统的温度升高而增加。由于溶质内在效应优于溶剂内在可压缩性，因此显示了负值。