During summer, water kept in an earthen pot becomes cool because

During summer, water kept in an earthen pot becomes cool because of the phenomenon of

  1. diffusion
  2. transpiration
  3. osmosis
  4. evaporation

Answer

During summer, water kept in an earthen pot becomes cool because of the phenomenon of evaporation.

Earthen pot has a large number of tiny pores in its walls. So, some of the water molecules continuously keep seeping through these pores to outside the pot. This water evaporates continuously and take the latent heat required for vaporisation from the remaining water. In this way, the remaining water loses heat and gets cooled.

The correct option is D.