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杯子倒扣纸不湿原理

更新时间: 2019-06-05 00:00:00     

玻璃杯里除了纸巾外,还充满空气,当玻璃杯垂直方向放进水中时,水和玻璃杯的接触面阻止空气外流,杯的内部形成一个封闭的空间。因为该空间内空气压力的存在,外面的水无法进入杯内,所以纸不会湿。不过如果把玻璃杯倾斜着放进水里,就会发生杯内空气外流,外面的水会进入杯内,纸巾就会被弄湿。如果杯底有个洞,杯里面的空气就会在水的浮力下从洞里跑掉,纸巾也会湿。

关键词: 杯子 倒扣 原理

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