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When a capillary tube of sufficient length is dipped into a liquid, the liquid rises or falls within the tube due to capillary action, which is the result of adhesive forces between the liquid and the tube's walls, and cohesive forces within the liquid itself. The height to which the liquid rises or falls is determined by the tube's diameter, the liquid's properties (such as surface tension and viscosity), and the interaction between the liquid and the tube material. This phenomenon is commonly observed with water in narrow tubes and is essential in various biological and engineering applications.

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1d ago

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