The capillary rise of fall of liquid is given by

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Question

This question was previously asked in

JKSSB JE Civil Jal Shakti 5 Dec 2022 Official Paper (Shift 2)

Answer 1

Explanation:

Capillarity:

It is the phenomenon of rising or falling in the liquid surface relative to the general adjacent level of the liquid, capillarity comes into existence, Because of cohesion and adhesion.
If cohesion is less than adhesion, then the capillary rise is observed. On the other hand, if cohesion is more than adhesion then capillary fall or depression is observed.

Capillary rise or fall is given by:

Also, some of the important terms involved in the capillary action are as follow

Contact angle:

The contact angle is a measure of the ability of a liquid to wet the surface of a solid.

Adhesive forces:

Attractive forces between molecules of different types are called adhesive forces.

Cohesive forces:

Attractive forces between molecules of the same types are called cohesive forces.

For contact angle 90° the cohesive forces and adhesive forces are in the equilibrium state.