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九年义务教育三年制初级中学教科书（物理）第二册（分子运动论、内能）一章中，“气体膨胀做功、温度降低”的实验是这样设计的：“拿一个大口的厚玻璃瓶，瓶内装入少量的水，用塞子塞紧。水上方的空气中有由于水的蒸发而产生的水蒸气。通过塞子上的开口往瓶里打气。观察当塞?
In the nine-year compulsory education three-year primary secondary school textbook (Physics) Book 2 (Molecular Movement Theory, Internal Energy) chapter, the experiment of “expanding gas and lowering the temperature” was designed in such a way as to “take a large mouthful of thick glass. In the bottle, the bottle is filled with a small amount of water and plugged in. The air above the water contains the water vapour produced by the evaporation of water, which is pumped through the opening in the stopper.