Cohesion and Adhesion

  • The force of attraction between the like molecules is known as cohesion and the force of attraction between the unlike molecules is known as adhesion.
  • When a glass rod is dipped in water, what clings to glass because of adhesive forces.
  • Due to the cohesive forces, all molecules of liquid tend to accelerate into the bulk of liquid and assume minimum surface area. As a sphere has a minimum surface area for a given volume, so the small liquid drops are nearly spherical.
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