Joule actually did this experiment, and he observed that for the gas expansions that he could do, that the temperature did not increase measurably.

事实上焦耳的确做了这个实验，他做到了,他能达到的最好实验要求，发现在可测量范围内没有观察到温度上升。

麻省理工公开课 - 热力学与动力学课程节选