Write a note on adhesion and cohesion.
Answers
As for the definitions, the tendency of two or more different molecules to bond with each other is known as Adhesion, whereas the force of attraction between the same molecules is known asCohesion.
Answer:
Adhesion happens between two dissimilar molecules or substances. When two similar substances or molecules face the force of attraction this force is known as cohesion force.
2. Adhesion is generally the force of attraction present between the water molecules and the walls of xylem vessels. Cohesion force is rampant among water molecules.
3. Capillary action and meniscus (the curved surface which is formed by any liquid in a cylinder) are the effects of adhesion. Surface tension, meniscus and capillary action are the effects of cohesion.
4. Adhesion is caused by electrostatic or mechanical forces that exist among two kinds of different substances. Cohesion is caused by hydrogen bonding and Van der Waals forces.
5. A strong adhesion force causes the liquid to spread all over the surface. A strong force of cohesion forms water droplets on any surface.