Question

Water stored in earthen pots become cool in summer because:
(A) Condensation
(B) Evaporation
(C) Precipitation
(D) None

Answer 1

Hint: Energy is released in the process of condensation. When heat is added to water, the temperature of water rises. The evaporation process is accompanied with the absorption of heat. When heat is absorbed from water, the temperature of the water lowers.

Complete step by step solution:
- Condensation is the process through which the physical state of matter changes from the gaseous phase into the liquid phase. For example, due to the sun, water in the sea, river etc. gets heated up and evaporates and forms water vapours, which rises and water vapours cool down and condenses to form rain.
When two ionic compounds are mixed, there is an exchange of ions between reactants, and one of the products produced is an insoluble substance called precipitate and the process is called precipitation.
When part of air is saturated with water vapours , at the right temperature there is condensation and precipitation. These two processes which make the air saturated are the cooling of air molecules and the addition of water vapour.
-The process of evaporation is the conversion of liquid into a gaseous state. An earthen pot is porous in nature. Water placed in earthen pots is evaporated from minuscule pores it has as it is made of mud particles. This evaporation of water produces a cooling effect. Some of the heat energy that is generated is used in the process of evaporation.

So, the correct option is (B) Evaporation.

Note: precipitation is the process behind the condensation of water vapour in the atmosphere that falls down under the influence of gravity. Rain and snow are the results of these phenomena. Condensation is important to the water cycle as it is responsible for the formation of clouds.