高中物理的“压缩气体做功,气体内能增加”的演示实验效果并不十分理想.笔者反复探索发现,改用纤维素硝酸酯做此实验,效果明显. 1 乙醚棉丸的欠缺 用乙醚棉丸做上述实验,存在着以下缺点:(1)有时只见到一筒白烟,看不到火焰;(2)有时虽能发光,但 High school physics “compressed gas to do work, increase the internal energy of gas” demonstration experiment results are not very satisfactory. The author repeatedly explored and found that the use of cellulose nitrate to do this experiment, the effect is obvious. 1 Epoxy cotton pill lack of ether cotton pellets The following shortcomings have been observed in the above experiments: (1) Sometimes only a barrel of white smoke is seen, no flame is visible, and (2) sometimes it emits light, but