气体膨胀做功温度降低演示仪器(下称演示仪)是初中物理中“改变物体热能的方法”所需演示仪器之一,也是九年制义务教育全日制中学物理教学大纲的教学内容“内能”中“气体膨胀做功,温度降低”的演示实验之一。现行的初中物理第二册图5—6所示的演示仪器,只用单一的试管组成,它的缺陷是当试管内气体膨胀做功把橡皮塞子 The gas expansion performance temperature reduction demonstration instrument (hereinafter referred to as demonstration instrument) is one of the demonstration instruments required for the “method of changing the thermal energy of objects” in the junior high school physics, and is also the teaching content of the nine-year compulsory education full-time secondary school physics syllabus “internal energy”. One of the demonstration experiments in “Gas Expansion Doing Work, Temperature Reduction”. The demonstration equipment shown in Figure 5-6 of the current junior high school physics second volume is composed of only a single test tube. Its defect is that when the gas in the test tube expands, the rubber plug is used to work.