The forces between the molecules of the substances are called intermolecular forces. There are two types of intermolecular forces as given below;
a) Cohesive Forces : The intermolecular force of attraction acting between the molecules of same substance is called Cohesive Force.
b) Adhesive Force : The intermolecular force of attraction acting between the molecules of different substances is called Adhesive Force.
- The liquid for which cohesive force is larger than adhesive force, does not wet the walls of vessel, e.g, mercury does not wet the glass vessel.
- The liquid for which adhesive force is larger than cohesive force, wets the walls of vessel, e.g, water wets the glass vessel.
a) Cohesive Forces : The intermolecular force of attraction acting between the molecules of same substance is called Cohesive Force.
b) Adhesive Force : The intermolecular force of attraction acting between the molecules of different substances is called Adhesive Force.
- The liquid for which cohesive force is larger than adhesive force, does not wet the walls of vessel, e.g, mercury does not wet the glass vessel.
- The liquid for which adhesive force is larger than cohesive force, wets the walls of vessel, e.g, water wets the glass vessel.
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