Why do you feel uncomfortably warm on a hot and humid day?
Solution 8RQ In a hot day, when we sweat, the water that comes out from the body as sweat start evaporating. For this evaporation, water needs latent heat of vaporisation, which is then supplied by our body and our body cools down. Now evaporation depends on the content of the water in the air. In a humid day, the content of the water is very high in the water. Hence the rate of evaporation becomes very low. Hence the heat transfer from our body also becomes very low. Because of this, our body does not cool down as effectively as in the case of the non humid day. That is why we feel very uncomfortable warm on a hot humid day.