Same chapter3 marksDifficulty: Medium
What is surface tension and why do small liquid drops take a spherical shape?
Properties of Bulk Matter
3 marksDifficulty: Medium
What is capillary rise, and why does water rise in a capillary tube while mercury falls?
Original Khojo Papers practice question — not from a past board paper.
Answer
Capillary rise is the rise of a liquid in a narrow tube because of surface tension. Water wets glass, so the adhesive force between water and glass exceeds the cohesive force within water, the meniscus is concave and the liquid is drawn up. Mercury does not wet glass, its cohesive force is greater, the meniscus is convex and the liquid is pushed down.
No citable source has been recorded for this record. Treat it as practice material, not as fact.
Explanation
The rise is inversely proportional to the radius of the tube.
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