NCERT Solution for Class 9 Science Chapter 1
Matter in Our Surroundings
NCERT Books for Session 2022-2023
CBSE Board and UP Board
Intext Questions
Page No-10
Questions No-2
How does the water kept in an earthen pot (matka) become cool during summer?
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– Matkas, or earthen pots, are made of porous clay that allows water to seep through the pot walls.
– External heat causes surface water to evaporate, creating an endothermic reaction that absorbs heat from the remaining water inside, reducing its temperature.
– The ongoing seepage and evaporation create a continuous cooling cycle as long as water remains in the pot.
– Thick clay walls act as insulation, shielding the stored water from rapid temperature changes in the surroundings.
– The combined effect of evaporative cooling and insulation makes matkas an effective, natural method to keep water cool without relying on high-tech equipment.
The earthen pot is porous with lot of pores on it, the water oozes out through these pores and the water gets evaporated at the surface of the pot thereby causing cooling effect. This makes the pot cold and the water inside the pot cools by this process.
When a liquid evaporates, the particles of the liquid absorb energy from the container to compensate the loss of energy during evaporation. This makes the remaining water cool.
There are some pores in an earthen pot through which the liquid inside the pot evaporates. This evaporation makes the water inside the pot cool. In this way, water kept in an earthen pot becomes cool during summers.
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