Which of the following processes add water vapour to the atmosphere?
(i) Transpiration (ii) Precipitation (iii) Condensation (iv) Evaporation

Explanation

(i) Evaporation: If the kinetic energy of molecules in the liquid state overcomes the intermolecular force of attraction between then, then the molecules will escape from the liquid state. This process in called evaporation.
(ii) Condensation: The vapour molecules are in random motion during whihc they collide with each other and also with the walls of the container. As the collision is inelastic, they lose their energy and as a result the vapour returns back to liquid state. This process is called as condensation.