初级中学化学课本第一章第一节《空气》中有一个演示实验 :关于空气中氧气含量的测定。由于我们学校没有玻璃钟罩 ,我便用“土方法”给学生们做了这个实验 ,而且效果很好 ,我还发动学生回家亲自动手做这个实验 ,同学们的学习情趣和积极性都很高。下面我简单地说一下这个实验的 There is a demonstration experiment in the first section of the first chapter of the chemistry textbook for junior high school chemistry: Determination of Oxygen Content in the Air. Since our school did not have a glass bell, I used the “soil method” to do this experiment for the students and it worked well. I also launched the students to go home to do this experiment myself. The students’ learning interest and enthusiasm were high. . Below I briefly talk about this experiment