《物理教师》曾刊有用可乐瓶做水火箭的令人激动的实验.受该实验的启发,我用同样的器材制作一个演示气体膨胀对外做功的实验,也得到了极好的效果,方法如下. 所用器材是一只无色透明大可乐瓶、一个与瓶口相配的橡皮塞、一个气门芯.在橡皮塞上钻一孔并将气门芯插入瓶塞上. “Physics Teachers” once published an exciting experiment on using Coke flasks as water rockets. Inspired by this experiment, I used the same equipment to produce an experiment that demonstrates gas expansion to do work. It also got excellent results. The method is as follows: The equipment used was a colorless transparent Cola bottle, a rubber stopper matched to the bottle mouth, and a valve core. Drill a hole in the rubber stopper and insert the valve core into the stopper.