推荐回答（1个）
水银会下落，不会往上跑受大气压强的影响，本身他保持在760mm的原因就是因为大气压强.下落的原因也是如此
全部掉下来
如果只有十厘米那么就选找一个水槽内密度与此长度可以达到大气压的一种液体
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