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Capillary Action

It is due to the forces of adhesion and cohesion (surface tension).

What about the role of atmospheric pressure and gravity?

How it works

  • The liquid has cohesive forces in the form of surface tension.
  • The adhesive forces on the capillary tube attract water molecules near the walls of the tube upwards.
  • The water molecules attract other water molecules upwards due to surface tension.
  • The adhesive forces attract more water molecules upwards
  • This can go on until the weight of the water column elevated matches the forces of adhesion and cohesion.

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