【摘要】 <正> 热容是计算熵、焓及自由能函数等热力学性质所必需的实验数据,也是传热工程设计所不可缺少的物性参数。鉴于热容数据在理论研究和实际应用上的重要性,热容测定也就成为一个较为活跃的研究课题。在获取热容数据的各种方法中,迄今仍以量热法较为准确和直接。十几年来,我们热化学研究组结合国家有关任务,开展了一系列的热容测定研究工作,建立了更多还原

【Abstract】 A precision adiabatic calorimeter for determining heat capacities of liquids at temperature ranging from -80℃ to 126℃ has been developed. Adiabatic control of the heat shield is carried out automatically. The temperature of the calorimeter sample vessel is measured-by means of a standard platinum thermometer.The reliability of this equipment may be justified by measuring the heat capacity of n-heptane which is used as a standard recommended by the Calorimetry Conference. The results obtained are found to be in accord with the NBS data with a deviation within 0.5%.With this device the heat capacities of 10 aqueous solutions of ethylene glycol at different concentrations have been measured.更多还原