人民教育出版社的现行全日制普通高级中学教科书《物理·第三册Ⅱ》学生实验 3,研究气体等温变化的规律 .主要实验步骤如下 ,该实验器材与装置如图 1所示 .ａ)把玻璃管插入量筒的水中 ,用刻度尺量出玻璃管中水柱长度ｌ,及量筒与玻璃管中水面的高度差ｈ ,如图 1 .这时被封闭的气 The current full-time regular high school textbook of the People’s Education Press, “Physical Third Book II” student experiment 3, studies the law of gas isothermal change. The main experimental steps are as follows. The experimental equipment and device are shown in Figure 1. a) The glass tube is inserted into the water of the measuring cylinder, and the length l of the water column in the glass tube and the height difference h between the measuring cylinder and the glass surface in the glass tube are measured with a scale, as shown in Fig. 1 .