The formula developed for R12, R22, R502 and R717 on the basic of saturated vapor viscositg can be used to predict the viscosity on both the saturated vapor line and the superheated vaper area.

• 按饱和蒸汽粘性系数导出的R12、R22、R502和R717的粘性系数计算式可用来计算饱和蒸汽线和过热蒸汽区的粘性系数。