Question

explain angle contact for cancave meniscus​

Answer 1

When a liquid has concave meniscus, the angle of contact is acute. When it has a convex meniscus, the angle of contact is obtuse. For pure water and perfectly clean glass, the angle of contact is 0°. For ordinary water and glass, it lies between 8° and 18°. For pure water and pure silver, the angle of contact is 90°.

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Answer 2

Answer:

HERE IS YOUR ANSWER

Explanation:

1. Consider a solid is in contact with liquid that partially wet solid.ex.kerosene in a glass bottle Consider a liquid molecule A on the surface of liquid near the wall of the Container.
2. The molecules experience adhesive force due to Solid Molecule and Cohesive force due to liquid molecule Shown by AP and AC respectively
3. The net force acting on molecule A is directed inside the solid shown by AR
4. For the stability of liquid Surface,the net force AR acting on molecule A must be normal to the liquid Surface at all points
5. For the molecule A of liquid creeps upward.So that the liquid Surface becomes Perpendicular to the net force AR which makes the meniscus Concave

EXPLANATION: HOPE IT HELPFUL

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