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Fav十万个为什么
为什么火柴一擦就会着火？
火柴一擦就会着火，主要是因为摩擦生热、火柴头和火柴盒的化学成分反应、化学反应释放热量。
1、摩擦生热：当火柴头在火柴盒侧面摩擦时，摩擦力会产生热量，使火柴头温度迅速升高。
2、火柴头和火柴盒的化学成分反应：火柴头含有氯酸钾、三硫化二锑等化学物质，火柴盒侧面涂有红磷和玻璃粉。摩擦时，红磷受热燃烧，同时释放的热量使氯酸钾分解，产生氧气。
3、化学反应释放热量：上述化学反应会释放大量热量，使火柴头上的易燃物（如硫磺）迅速燃烧，从而点燃火柴杆。
总结：火柴一擦就会着火，主要是因为摩擦生热、火柴头和火柴盒的化学成分反应、化学反应释放热量。
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