Answer :

Final answer:

The curving of the liquid surface in a thin tube is due to capillarity or capillary rise. This is caused by the surface tension of the liquid and the tendency for the liquid to spread itself upward onto the solid surface of the tube.

Explanation:

The curving of the liquid surface in a thin tube is due to capillarity or capillary rise. When a hollow tube with a very small diameter is immersed in a liquid that wets the surface of the tube, the liquid rises up in the tube above the liquid level outside the tube. This is because of the surface tension of the liquid and the tendency for the liquid to spread itself upward onto the solid surface of the tube.

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