焦—汤效应远比焦耳效应显著吗？

Is the Joule Thomson effect more notable than the Joule effect?

本文指出在Ｐ→０极限条件下，将焦─汤系数μ与焦耳系数λ进行比较，并得出焦─汤效应大于焦耳应效的结论是不妥的．其原因是μ与λ具有不同的士纲．文中提出了两种对比方法．一种是选择性质相同的偏导数μ与．来表征其微分效应并进行对比；另一种是对有限过程的两种温变进行了估算．其结果都表明，焦─汤效应与焦耳效应相差并不悬殊．

In this paper we pointed out that under limiting condition p→0, it is notproper to drow out the conclusion of Jowle-Thomson effect is more notable than Jowle ef-fect by comparing the Joule-Thomson coefficient μ with Joule coefficient λ.The reason isthe μ and λ have different dimension. Two compazing methods hare been put forward in thispaper as follows,the one is to indicate its differential effect by selecting same characteristicderivates μ and. and then to compare them each other The other is to estimate the twokinds of temperature in finite process. The results Showed that there is no great dispanity be-tween the Joule-Thomson effect and Joule effect.