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纸片托水的原理是什麼越详细越好
更新时间: 2020-10-05 00:00:00  

1、水满的时候能托住,是因为大气压力比水的重力更大,相当于汞柱压力计,汞柱可以被大气压压至76厘米高,所以此时纸能托住水。

2、当杯中还有空气时,上下空气压力抵消了,纸就托不住水了。

关键词: 纸片 原理 详细

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