A capillary tube is dipped in water vertically. It is long enough for the water to rise to the maximum height h in the tube. The length of portion immersed in water is l < h. The lower end of the tube is closed and then the tube is taken out and opened again. Will all the water flow out of tube? Explain.

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Solution

No, the water will not flow out. When the tube is taken out, a convex meniscus is formed and force due to surface tension comes into play in the upward direction which keeps the water column remaining in the tube will be l + h

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