Geography
Assertion (A): Under conditions of high relative humidity, the rate of evaporation of sweat from the skin decreases and the human being feels warm and uncomfortable.
Reason (R): The human body dissipates heat through perspiration and its evaporation.
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true but R does not explain A.
- A is true but R is false.
- A is false but R is true.
Humidity
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Answer
Both A and R are true and R is the correct explanation of A.
Explanation — The human body cools itself through perspiration and the evaporation of sweat. When the relative humidity is high, the air already contains a large amount of water vapour, so evaporation of sweat slows down. As a result, the body loses heat less efficiently, making a person feel warm and uncomfortable.
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