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孔明灯怎样升空的

更新时间: 2020-09-25 00:00:00     

孔明灯是利用空气浮力升空的。制作孔明灯的材料是用密度较小的竹子编织而成,周围用密度更小的棉纸糊起来,整个孔明灯的质量和重力都很小。当孔明灯下面支架上的蜡烛点燃后,孔明灯内部的空气被加热,加热的空气发生了膨胀,密度小的热空气上升到灯内的上部,密度较大的冷空气从下面被挤了出来,孔明灯的平均密度变小,一旦小于空气的密度时,孔明灯自身的重力便小于空气浮力,这样孔明灯就可以升空。

关键词: 孔明灯 怎样 升空

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