2. How does the water kept in an
earthen pot (matka) become cool
3. Why does our palm feel cold
when we put some acetone or
better on a hot dry day?
during summer?
petrol or perfume on it?
4. Why are we able to sip hot tea or
milk faster from a saucer rather
than a cup?
5. What type of clothes should we
wear in summer?
Answers
•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
•When we put some acetone or petrol or perfume on our palm, it evaporates. During evaporation, particles of the liquid absorb energy from the surface of the palm to compensate for the loss of energy, making the surroundings cool. Hence, our palm feels cold when we put some acetone or petrol or perfume on it.
•The more the surface area the more is the cooling. ... Larger is the surface area more is the evaporation. Thus evaporation is faster in a saucer causing more cooling than in a cup. For this reason, we are able to sip hot tea or milk faster from a saucer than a cup.
•We should wear light coloured cotton clothes in summer bcoz they are best at absorbing sweat and keep us cool..!