In the present work, two different intermolecular potentials are considered for the three real gases such as Ar, Kr and Xe. The effect of attraction term of the potential models on internal energy, enthalpy, entropy and Joule-Thomson (JT) coefficient of aforementioned gases has been investigated. To This end, the second virial coefficient of each potential was analytically derived. The suggested potential models have different attraction terms and the same repulsive terms. Our theoretical results in this work have been compared with experimental data. Our results reveal that the attraction term of the interaction potential has an important and main role to the thermodynamic properties of the selected gases. According to the results, it is found that the calculated thermodynamic function of the aforementioned gases obtained using both potential models are in acceptable agreement with available data. The degree of agreement depends strongly on the type of the used potential model and the range of pressures and temperatures. For instance, the JT coefficient of the Kr gas calculated by potential model (1) at high pressures and temperatures are in good agreement with experimental results. This property for the Ar gas has better agreement when we employ the potential model (2). This work allows us to select the suitable potential model and desired rages of pressure and temperature to give better results in comparison with experimental data.

在目前的工作中，考虑了三种真实气体（如 Ar、Kr 和 Xe）的两种不同的分子间势。研究了势模型的吸引力项对上述气体的内能、焓、熵和焦耳-汤姆逊（JT）系数的影响。为此，分析导出每个势的第二维里系数。建议的潜在模型具有不同的吸引力项和相同的排斥项。我们在这项工作中的理论结果已与实验数据进行了比较。我们的结果表明，相互作用势的吸引项对所选气体的热力学性质具有重要和主要的作用。根据结果​​，发现使用两种潜在模型获得的上述气体的计算热力学函数与可用数据具有可接受的一致性。一致性程度很大程度上取决于所使用的电位模型的类型以及压力和温度的范围。例如，高压高温下势模型(1)计算得到的Kr气体的JT系数与实验结果吻合较好。当我们采用势模型 (2) 时，Ar 气体的这一特性具有更好的一致性。这项工作使我们能够选择合适的潜在模型和所需的压力和温度范围，以提供与实验数据相比更好的结果。一致性程度很大程度上取决于所使用的电位模型的类型以及压力和温度的范围。例如，高压高温下势模型(1)计算得到的Kr气体的JT系数与实验结果吻合较好。当我们采用势模型 (2) 时，Ar 气体的这一特性具有更好的一致性。这项工作使我们能够选择合适的潜在模型和所需的压力和温度范围，以提供与实验数据相比更好的结果。一致性程度很大程度上取决于所使用的电位模型的类型以及压力和温度的范围。例如，高压高温下势模型(1)计算得到的Kr气体的JT系数与实验结果吻合较好。当我们采用势模型 (2) 时，Ar 气体的这一特性具有更好的一致性。这项工作使我们能够选择合适的潜在模型和所需的压力和温度范围，以提供与实验数据相比更好的结果。