目前废弃的矿泉水瓶(或各种饮料瓶)较多,本人在实验教学中利用它,既为教学带来了方便,又能取得良好的实验效果。现介绍如下。a．矿泉水瓶用于化学实验的优点。①瓶口气密性特别好,贮气时间长；②瓶口标准,与7号橡皮塞恰好配套；③容积规格多,可根据实验需要任意选用；④质轻,便 At present, there are many abandoned mineral water bottles (or various beverage bottles). I use it in experimental teaching, which not only brings convenience to teaching, but also achieves good experimental results. The introduction is as follows. a. Mineral water bottles are used for the advantages of chemical experiments. 1 bottle of breath tightness is particularly good, long storage time; 2 bottle standard, and 7 rubber stoppers exactly matching; 3 volume specifications, can be selected according to experimental needs; 4 light, then