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.
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.
Related Questions
The ratio between the absolute humidity of a given mass of air and the maximum amount of water vapour that it can hold at the same temperature:
- Humidity
- Dew Point
- Relative humidity
- Latent heat
The temperature at which air gets fully saturated:
- Humidity
- Dew Point
- Relative humidity
- Latent heat
The measure of the actual amount of water vapour in the air, regardless of temperature:
- Absolute Humidity
- Humidity
- Dew Point
- Relative Humidity
The process by which products of condensation, viz water droplets, ice crystals, sleet etc. fall to the ground:
- Evaporation
- Humidation
- Precipitation
- Condensation