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有一道初中升学试题:“某同学在课外活动中做了如下试验:取两个粗细相差很小的试管,在大试管里装大半管水,把小试管底朝下地放到大试管里,再把这样装好的两个试管倒过来,就会看到大试管里的水渐渐流出。同时小试管自动上升到大试管里(如图1)。试解释这种现象。”广东科技出版社的《初中升学物理试题解法分
There was a junior high school entrance examination: “A classmate did the following experiment in extracurricular activities: Take two test tubes with small differences in size, install half of the water in a large test tube, and place the small test tube on the bottom of the test tube in a large test tube. Then turn the two tubes in this way upside down and you will see the gradual outflow of water from the large tubes, while the small tubes automatically rise into the large tubes (Figure 1).Explain this phenomenon.“Guangdong Science and Technology Publishing Society’s ”Solving Junior High School Physics Test Solution"