Capillary Action

 Capillary Action

Introduction : Various action like absorbing of ink by a blotting paper, transportation of water from root of the tree to various parts of the tree, rise of a water in any capillary tube are all related to an interesting action of a liquid called as capillary action. Let us understand the concept in details.

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Capillarity : The rise or fall of a liquid inside a capillary tube when it is dipped in a liquid is called as Capillarity or capillary action.

Capillary tube: The rise or fall of a liquid inside a capillary tube when it is dipped in a liquid is called as Capillarity or capillary action.

Expression for capillary Rise or fall

Consider a container containing liquid in it. a capillary tube is immersed in a liquid such that liquid level rises in the capillary. Consider a point A which is just outside the the free surface of liquid in capillary tube. Point B is just below the concave surface. Point D  is on a free surface of liquid at exposed to atmosphere experiencing atmospheric pressure.The  rise of a liquid level in capillary is given by,

Now consider the Capillary portion as shown in figure below,

│<<< Angle of contact││ Fluid in motion>>>│

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 Related Topic : Mechanical Properties of fluid      Pressure due to liquid column     Absolute and gauge pressure  Hydrostatic Paradox       Pascal's Law        Measurement of pressure         Surface Tension Surface Energy         Angle of contact          Capillary Action            Motion in a fluid                    Critical velocity and Reynold's Number                      Viscosity                 Stokes' Law            Terminal velocity                 Equation of continuity                  Bernoulli Equation          Speed of Efflux    Ventury Tube