兆帕级压强范围内气体氩维里系数的确定

The Virial Coefficient of Argon for Pressure in the Megapascal Region

设计了用于测量兆帕级压强范围内气体等温状态方程的实验装置，对300K、0～60MPa条件下氩气密度随压强的变化进行了精确测量。通过拟合实验数据，得到了氩气的第二和第三维里系数。由实验气体氩的维里系数，确定了其林纳德一琼斯势（L—J势）参数。采用该势参数对不同温度下氩气的状态方程进行了拓宽计算，并与其它实验和经验状态方程进行了比较分析，确定其适用范围。

Using a self-designed measuring device, the argon density has been measured at 300 K for pressure lower than 60 MPa. The second and third virial coefficients are obtained by fitting the experi-mental data, and the new parameters of Lennard-Jones potential are derived from the experimental virial coefficients. Furthermore, the temperature-dependent virial coefficients are calculated by these new potential parameters. The calculated densities from these virial equations are compared with other experiments and empirical equation of states for determining the application range of the present equation.