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铁丝为什么要绕成螺旋状

2022-03-22

做铁丝燃烧的实验时,把铁丝绕成螺旋状为了增加铁丝的局部温度与氧的接触面积,在铁丝下端系一根火柴杆的目的引燃铁丝,要在集气瓶底放少量水或铺一层细沙为了增加接触空气。

把铁丝绕成螺旋状目的是增加铁丝的局部温度和与氧的接触面积;在铁丝下端系一根火柴作用是引燃铁丝;点燃火柴后待火柴快燃尽时时,将铁丝伸入氧气瓶中,应该观察到的现象是剧烈燃烧火星四射,生成黑色固体。


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