R134a和R123的热力学性质采用修正的Benedict Webb-Rubin（MBWR）状态方程，该状态方程适用于临界点、蒸汽压、饱和液体和蒸汽体积、过热压力体积温度（p-V-T）行为的实验测量，以及由p-V-T和声速测量得出的第二维里系数。理想气体参考状态的热容由低密度蒸汽的声速测量确定。还介绍了表面张力。总结了实验方法和结果，并与性能公式进行了比较，如果可能，还与设备中的其他来源进行了比较。给出了使用MBWR状态方程制备的R134a和R123热力学性质的表格和图表。虽然各种测量涵盖不同的温度和压力范围，但MBWR公式适用于压力高达10000 kPa（1500 psia）的液相和汽相； R134a的适用温度范围为233至450 K（-40°至350°F），R123的适用温度范围为255至450 K（0°至350°F）。引文:ASHRAE Transactions，第95卷，pt。1989年，温哥华

The thermodynamic properties of R134a and R123 are formulated using a modified Benedict-Webb-Rubin (MBWR) equation of state fit to experimental measurements of the critical point, vapor pressure, saturated liquid and vapor volumes, superheated pressure-volumetemperature (p-V-T) behavior, and second virial coefficients derived from p-V-T and sound speed measurements. The heat capacity of the ideal gas reference state is determined from sound speed measurements on the low density vapor. Surface tensions are also presented. The experimental methods and results are summarized, compared to the property formulation and, where possible, compared to other sources in the fiterature. Tables and diagrams of the thermodynamic properties of R134a and R123, prepared using the MBWR equation of state, are presented. While the various measurements cover different ranges of temperature and pressure, the MBWR formulation is applicable in both the liquid and vapor phases at pressures up to 10,000 kPa (1500 psia); the applicable temperature range is 233 to 450 K (-40° to 350°F) for R134a and 255 to 450 K (0° to 350°F) for R123.