Capillary rise of water in a narrow glass tube occurs because
Correct answer: A. the adhesive forces between water and glass are stronger than the cohesive forces within water
- A. the adhesive forces between water and glass are stronger than the cohesive forces within water
- B. the cohesive forces are stronger than the adhesive forces
- C. the air pressure inside the tube is greater
- D. water is denser than glass
Explanation
Water wets glass because it is attracted to the silica surface more strongly than to itself, so it climbs the walls and drags a column up, forming a concave meniscus. Mercury shows the opposite behaviour, with stronger cohesion, so it is depressed in the tube and forms a convex meniscus. The narrower the tube, the higher the rise.
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About Properties of Liquids
Liquid behavior depends on intermolecular forces, which produce surface tension, viscosity, capillary action and a definite volume without a fixed shape. The topic also covers vapor pressure, evaporation, boiling point and the effect of temperature and external pressure, while distinguishing evaporation at the surface from boiling throughout the liquid.
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