为了加深学生对“液体沸腾时要吸收热量”的理解,不少刊物和参考书均介绍用图1的装置进行演示验证,认为“观察到大烧杯里水沸腾了,而试管中的水不沸腾”,其原因是试管“浸泡在和它等温的水里,不发生热传递,不能吸收热量”,从而证明液体虽达沸点,并不吸收热量也不沸腾,也就是 In order to deepen students’ understanding of the need to “absorb heat when the liquid boils,” many publications and reference books describe demonstrations using the device of Figure 1. “It is observed that the water in a large beaker boils, and the water in a test tube does not boil. The reason for this is that the test tube “soaked in its isothermal water, there is no heat transfer, can not absorb heat,” thus proves that although the liquid reaches the boiling point, it does not absorb heat nor boiling, that is,