ADHESION AND COHESION

Adhesion and Cohesion

As we learnt that particles are bonded by force of attraction called intermolecular force

Intermolecular Force

Intermolecular force is force of attraction or repulsion between particles of matter (atom or molecules) 

Types of Intermolecular Force

There are two include

i)        Cohesive force

ii)       Adhesive force

Cohesion

Cohesion force is the force of attraction between the molecules of the same kind. For Example, water and water molecule

Adhesion

Adhesion is the force of attraction between the molecules of the different substance. For Example, water and glass molecules

Effect of Adhesion and Cohesion

i)        Mercury form convex (downward) meniscus because it possesses strong cohesive force than adhesive force

ii)       Water form concave (upward) meniscus because it possesses strong adhesive force than cohesive force

iii)     Drop of water on the surface of some leaves is perfect sphere due to strong cohesive force than adhesive force

iv)     Drop of mercury on the surface of different material is perfect sphere due to strong cohesive force than adhesive force

v)       Water spread over glass because it possesses strong adhesive force than cohesive force

Application of Adhesive and Cohesive

i)        Adhesive Used to stick two different objects. For Example, using glue or tape

ii)       Plant use the cohesive of tissue to repair damage Ink stick on paper

iii)     Transport of water in plant and animal due to adhesive force Adhesive is the source of friction