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[题目]观察过程:拿出一支看来与普通蜡烛一样的白色蜡烛,把它慢慢地插入蜡烛盘中。这支蜡烛不经点火便突然自动着火燃烧起来了(题图),而且还产生白色的缭绕烟雾。请问,这支蜡烛为什么不经点火就能着火燃烧起来呢?
[Subject] Observation process: Take out a white candle that looks like an ordinary candle and slowly insert it into the candlestick. The candle suddenly burned spontaneously without ignition (chart) and produced white smoke. Excuse me, why can this candle burn without ignition?