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初中化学课本第三章第四节〔实验3—6〕——二氧化碳熄灭蜡烛火焰的实验,除了说明二氧化碳的重要性质二氧化碳不能支持燃烧外,还说明二氧化碳比空气重,能象倾倒液体那样,从一个容器倒入另一个容器。因此做好这一实验非常重要。但是这实验受气流、仪器容积和实验操作等因素的影响很大,若稍不留心就会导致实验失败。或者中部蜡烛火焰先熄灭,或者下部熄灭中部蜡烛火焰不熄灭,或者中部下部蜡烛火焰一起熄灭。为此,笔者对实验做了一点改进,效果很好。
In the third chapter of the junior high school chemistry textbook (Experiment 3-6), the experiment of extinguishing the candle flame of carbon dioxide shows that, in addition to the important property of carbon dioxide, that carbon dioxide cannot support combustion, it also shows that carbon dioxide is heavier than air and can be dumped like a liquid. One container is poured into another container. Therefore, it is very important to do this experiment. However, this experiment is greatly affected by the airflow, instrument volume, and experimental operation. If you do not pay attention, it will cause the experiment to fail. Or the candle flame in the middle is extinguished first, or the flame in the lower part of the candle is not extinguished in the middle, or the candle flame in the middle lower part is extinguished. For this reason, the author did a little improvement on the experiment and it worked well.