Question

24. Explain capillarity with one example and deduce ascent formula.
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Answer 1

In this case, the contact angle is greater than 90 deg and the meniscus is convex. The formula for capillary rise can be derived by balancing forces on the liquid column. The weight of the liquid (πr2hρg π r 2 h ρ g ) is balanced by the upward force due to surface tension (2πrσcosθ 2 π r σ cos ⁡ )