define capillary action 2021

 Capillarity:-

A tube with a fine and uniform bore throughout its length, is called a capillarity tube. When one end of glass capillary tube open at both ends is dipped in a liquid like water, the liquid rise or falls in the capillary tube above or below the liquid level in container. The phenomenon of rise or falls of liquid in capillary tube, is known as CAPILLARITY.


About the height raised by liquid::-

A) Greater the surface tension, greater will be the hight.

B) Greater the radius of capillry tube, smaller will be the  height.

C) Greateer the angle of contct, smaller will be the height.

D) Greater the densitty of liquid, smaller will be  the height.

Note:-

* Liquid having acute angle if contact rise in a capillary tube.

* liquid having obutse angle of contact fall in a capillary tube.

* Rise of liquid in a capillary tube dose not violate law conservation of the energy.

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