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少数同学根据“测定空气中氧气含量”实验,提出假设:蜡烛燃烧先消耗完可乐瓶上方的氧气,使可乐瓶上方的气体变成了不支持燃烧且密度比空气小的氮气,氮气是使蜡
According to the “measure oxygen content in the air” experiment, a few students put forward the hypothesis that the candle burns the oxygen above the Coke bottle first, and the gas above the cola bottle becomes nitrogen that does not support combustion and has a lower density than air. Nitrogen is Make wax