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we take a capillary tube of 9 cm .then we can measure the capillary rise of fluid in it is 6 cm. after that we do this same experiment by using a tube of 5 cm. then what about the fluid rise? it will overflow? or it stay in the meniscus portion? or come down? |
A capillary tube is a very thin tube made of a rigid material, such as
plastic or glass. The tube is used to collect samples of liquids, which
will flow up into the tube against the effects of gravity in a process called capillary action. All capillary tubes function through a process called capillary action. This process uses two physical forces,surface tension and adhesion. Capillary tubes are by nature very thin. Because of this fact, there is a high amount of adhesion around the inside of the tube, which creates a surface area at the top and bottom of a liquid in the tube. As a result, when a liquid encounters a capillary tube, the liquid is drawn up into the tube by the forces of adhesion, creating a surface with a specific surface tension that remains intact due to the adhesion of the sides of the tube. The liquid will continue to rise up the capillary tube until the weight of total mass of all the liquid in the tube exceeds the surface tension at the bottom of the tube.So the water will not come down. |