Question

give reason for the following-(a) water kept in an earthen pot remains cool during summer(b) clothes dry faster if we spread them(c) steam produces more severe burns than boiling water(3 mark)

Answer 1

a -because in summer the water on the surface of earthen pot evaporate and water gains energy to evaporate from water inside making the water cool.

b-drying of clothes is due to evaporation and it is a surface phenomenon ,so if we make area large, more water can evaporate at the same time.

c-because steam has more kinetic energy(heat) than the boiling water, that is why it produce more severe burns
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Answer 2

First of all, what is evaporation ??

→ evaporation is a process in which liquid get converted in it's gaseous state without boiling. we know that particles are always moving and they are never at rest. There are particles with different amount of kinetic energy. In case of liquids, a small fraction of particles at the surface, having higher kinetic energy, is able to break away from the forces of attraction of other particles and it gets converted into vapour. It is the phenomenon of change a liquid into vapours at any temperature below the boiling point.

Now,

(a) during summer, the air is more dry and hot. So evaporation takes place more. We know that during evaporation, the particles at the surface of liquid gain energy from the body surface and change into vapours. The earthen pot is made up of mud and it has many tiny holes. The latent heat of water is absorbed by the tiny holes of the pot and leaving the left water cool.

(b) clothes dry up faster if we spread them because of the increase in surface area. we know that evaporation is a surface phenomenon. It the surface area is increased, the rate of evaporation also increases. Hence while putting cloths for drying up we spread them out dry faster.

(c) as we know, to convert liquid in vapour, more latent heat is required. So the steam has more heat as compared to water. Hence, steam causes more severe burns.

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