Q50 of 160 Page 36

Why does a desert cooler cool better on a hot, dry day?

The cooling in a desert room cooler is caused by the evaporation of water. The higher temperature on a hot day increases the rate of evaporation of water, and the dryness of air also increases the rate of evaporation of water. And due to this increased rate of evaporation of water, a desert room cooler works better on a hot and dry day.


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48

Why does all the water of the earth not get evaporated during hot summer days?

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If the back of your hand is moistened with alcohol, you will find that it rapidly becomes dry. Why is it that while it is drying, your hand feels cool?

 51

How does the water kept in an earthen pot (matka) become cold during summer?

 52

What type of clothes should we wear in summer? Why?