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初三物理“利用内能做功”的实验，是利用酒精灯加热试管中的水，水蒸气对橡胶塞做功，把橡胶塞喷了出去。此实验有如下的缺点：1郾器材太多，携带不便。2郾加热时间过长，分散了学生的注意力。3郾做功时有热水溅出，操作不当有可能喷到学生身上。4郾由于橡胶塞有弹性，落到地
In the third year of the physical experiment of “using internal energy to do work”, the water in the test tube was heated with an alcohol lamp, and water vapor was used to do work on the rubber stopper and the rubber stopper was sprayed out. This experiment has the following shortcomings: 1 too much equipment, inconvenience to carry. 2. The long heating time distracts the students’ attention. 3 Hot water splashes out when work is done. It may spray on students if it is not handled properly. 4郾Because of the elasticity of the rubber stopper, it falls to the ground