Goodwin Robert D
Institute for Basic Standards, National Bureau of Standards, Boulder, Colo. 80302.
J Res Natl Bur Stand A Phys Chem. 1975 Jan-Feb;79A(1):71-79. doi: 10.6028/jres.079A.003.
This equation of state was developed from compressibility data on methane and ethane. The highly-constrained form originates on a given liquid-vapor coexistence boundary (described by equations for the vapor pressures and the orthobaric densities). It then requires only five least-squares coefficients, and ensures a qualitatively correct behavior of the (, ) surface and of its derivatives, especially about the critical point. This nonanalytic equation yields a maximum in the specific heats (, ) a t the critical point.
这个状态方程是根据甲烷和乙烷的压缩性数据推导出来的。这种高度受限的形式源自给定的液-气共存边界(由蒸气压和正压密度方程描述)。然后它只需要五个最小二乘系数,并确保(,)表面及其导数具有定性正确的行为,特别是在临界点附近。这个非解析方程在临界点处的比热(,)中产生一个最大值。