rise of liquid in capalarity flow?

asked by madhuri(student)

DEFINITION: A rise in a liquid above the level of zero pressure due to a net upward force produced by the attraction of the water molecules to a solid surface, e.g. glass, soil (for those cases where the adhesion of the liquid to the solid is greater than the cohesion of the liquid to itself)

Capillary Rise in Water and Mercury

Capillary Rise

This is a close view of two narrow tubes, one containing water and the other containing mercury. The tube containing water exhibits positive capillary rise, where the water adheres to the sides of the tube causing the fluid to rise slightly. The tube containing mercury exhibits negative capillary rise. The fluid is drawn away from the walls of the tube, causing the fluid to sink slightly.