CAPILLARITY

CAPILLARITY 

                      Capillarity is defined as a phenomenon of rise or fall of a liquid surface in a small tube relative to the adjecent general level of liquid when the tube is held vertically in the liquid. The rise of liquid surface is known as capillary rise while the fall of liquid surface is known as capillary depression. It is expressed in terms of cm or mm of liquid. Its value depends upon the specific weight of the liquid, diameter of the tube and surface tension of the liquid.

CAPILLARITY RISE 

EXPRESSION FOR CAPILLARY RISE. 

                     Consider a glass tube of small diameter ‘d’ opened at both ends and is inserted in a liquid, say water. The liquid will rise in the tube above the level of the liquid. 

      Let, h  = height of the liquid in the tube

                        Under a state of equilibrium, the weight of liquid of height ‘h’ is balanced by the force at the surface of the liquid in the tube is due to surface tension. 

      Let  𝛔 = Surface tension of liquid

              θ = Angle of contact between liquid and glass tube.

EXPRESSION FOR CAPILLARITY RISE

   

                                   The End. 

    Please comment if you have any query. 

Disclaimer : An attempt has been made to make this blog error free. If there is any error, please forgive.

       



                                                           Thank you.