In addition, a new isobaric EOS of four parameters is obtained by using the second isothermal bulk modulus and we may test, compare and analysis it by comparing with the experimental data.

• 本论文还在势函数理论的基础上，通过引进等温体积弹性模量的二阶导数，推导出了一个新的四参量的等压物态方程，并对得到的方程进行了验证、比较和分析。