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66期
The passage discusses the phenomenon of water droplets forming round shapes due to surface tension, which is a force exerted by water molecules pulling the surface inward. When a small hole is present, water molecules create a thin film that seals the opening, preventing water from flowing out unless the pressure exceeds the cohesive forces holding them together. This explains why we observe circular water droplets on leaves, faucet drips, and in other situations.



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