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现行教材各版本对“空气中氧气体积分数的测定”这一实验,几乎采用相同的设计方式,该装置不乏许多优点,但也有不少缺陷未能避免。总之,改进后的装置具有测量精度高、误差小、可操作性强,还能有效地防止该实验常见的“冲塞”现象的发生。尤为重要的是,该设计既能充分激发学生的环保意识和质疑、创新精神,又可以培养学生严谨求实的科学态度。
The current version of textbooks uses almost the same design method for the “determination of the volume fraction of oxygen in the air.” The device has many advantages, but there are also many defects that have not been avoided. In short, the improved device has high measurement accuracy, small error, and strong operability, and can effectively prevent the phenomenon of “plugging” that is common in the experiment. What is particularly important is that the design can not only fully stimulate students’ awareness of environmental protection and the spirit of questioning and innovation, but also can cultivate students’ rigorous and realistic scientific attitude.