(a) Why does temperature in Mumbai and Chennai not fall as low as it does in Delhi.

(b) Give the properties of water responsible for controlling the temperature of our body.

(a) Mumbai and Chennai are on the shores of the sea. As water has high specific heat capacity, the presence of a large amount of water is able to modify the climate of the nearby land areas, making them warmer in winter and cooler in summer. Land and sea breeze also take place because of this great moderating property. Hence, the temperature in Mumbai and Chennai does not fall as low as it does in Delhi.

(b) Properties of water responsible for controlling the temperature of our body:

1. High specific heat capacity — Water has a high specific heat capacity enabling it to absorb heat from the body and release it to the environment without causing significant changes in its own temperature.
2. High latent heat of vaporization — As water has a high latent heat of vaporization, it requires a large amount of heat energy to change from liquid to gas. This property allows sweat to evaporate from the skin, taking heat from the body and cooling it down.