Question

describe capilary action a) capilary rise
b) capilary fall​

Answer 1

Answer:

If a segment of a capillary tube is submerged in a liquid, the liquid in the capillary tube can rise or fall. This effect is called capillarity and is caused by the surface tension. The rise or fall depends on the relative magnitudes of the cohesion and the adhesion of the liquid to the walls of the capillary tube.

Answer 2

Answer:

Capillary rise or capillarity is a phenomenon in which liquid spontaneously rises or falls in a narrow space such as a thin tube or in the voids of a porous material. ... Internal cohesion in mercury, on the other hand, pulls down the liquid to form a convex meniscus. Menisci are thus a manifestation of capillary action.