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怎样证明瓶子里有空气

更新时间: 2021-11-26 22:45:41     

1、把瓶子倒置于水中,(不能斜放)水不会流入瓶子中,向下压瓶子,会感到有一股阻力,证明瓶子中有空气。

2、取一个瓶子,装满水,然后倒放,水就会流出,然后放进去一块白磷,盖上盖子,等到白磷自燃后,将瓶子放进水中,然后松开盖子,水就会进入,证明瓶中原来进去了空气,使得白磷自燃,得证。

关键词: 怎样 证明 瓶子 空气

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