What is Capillarity? Explain briefly
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Here is your answer,
Capillarity is the phenomenon by which the liquid level inside a capillary tube rises or falls above or below the outside level.
So, now consider a glass capillary tube put vertically in water, as shown in figure. As the adhesive forces between water and glass molecule is more then the cohesive force between two water molecules. As such the water molecules ''crawl'' up along the tube and the angle of contact becomes acute. The liquid meniscus inside the tube is more than the outside. This is called Capillary rises.
S Now we have to consider a glass capillary tube put vertically in mercury ( YOU CAN REFER THE BELOW PIC) . The cohesive force between two mercury molecules is greater than the adhesive forces between water and glass molecules. As, such the mercury sink down the capillary tube due to their so called aversion towards glass molecule. The angle of contact is obtuse. The liquid meniscus inside the tube is convex upward. The mercury level inside the tube is less then the outside. This is called Capillary depression.
( EXTRA INFORMATION ABOUT CAPILLARITY)
Hope it helps you !
Here is your answer,
Capillarity is the phenomenon by which the liquid level inside a capillary tube rises or falls above or below the outside level.
So, now consider a glass capillary tube put vertically in water, as shown in figure. As the adhesive forces between water and glass molecule is more then the cohesive force between two water molecules. As such the water molecules ''crawl'' up along the tube and the angle of contact becomes acute. The liquid meniscus inside the tube is more than the outside. This is called Capillary rises.
S Now we have to consider a glass capillary tube put vertically in mercury ( YOU CAN REFER THE BELOW PIC) . The cohesive force between two mercury molecules is greater than the adhesive forces between water and glass molecules. As, such the mercury sink down the capillary tube due to their so called aversion towards glass molecule. The angle of contact is obtuse. The liquid meniscus inside the tube is convex upward. The mercury level inside the tube is less then the outside. This is called Capillary depression.
( EXTRA INFORMATION ABOUT CAPILLARITY)
Hope it helps you !
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Capillarity
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The function of fluid in contact with a solid substance in which the surface of the fluid arises or falls due to the attraction of the fluid molecules and the attraction of solid molecules. If a thin open tube is inserted in the glass of water, due to capillary the water level in the tube will be above the glass level of the water.
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The function of fluid in contact with a solid substance in which the surface of the fluid arises or falls due to the attraction of the fluid molecules and the attraction of solid molecules. If a thin open tube is inserted in the glass of water, due to capillary the water level in the tube will be above the glass level of the water.
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