What is capillary action? Derive the formula for rise of liquid in a capillary tube immersed vertically in liquid.
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The phenomenon of a rise and fall of a liquid inside a capillary tube when it is dipped in the liquid is called capillary action or capillarity. A capillary tube is a tube with a very fine bore. When a glass capillary is immersed in water, water rises inside the tube.
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