初三新编化学教材中有验证空气中氧气含量的测量演示实验,在此实验中需使用钟罩一个,由于缺乏这种仪器,往往使实验开不出来。近年来笔者通过多次实践,将塑料金龙鱼油瓶代替钟罩,进行空气中含氧气的测定实验,实验效果很好。 In the third edition of the chemistry textbook, there was a demonstration experiment to verify the measurement of oxygen content in the air. In this experiment, a bell jar was used. Due to the lack of such instruments, the experiment could not be opened. In recent years, the author has practiced many times to replace the plastic golden aquarium oil bottle with a bell jar and carried out an oxygen containing air test. The experimental results are very good.