Question

Which of the factors does not increase the rate of evaporation?

• A. increase in temperature
• B. increase in wind speed
• C. increase in surface area
• D. increase in humidity

Answer 1

The correct option is D

increase in humidity

Explanation for the correct options: -

(d) Increase in humidity will decrease rate of evaporation.

1. Humidity is the amount of water vapour in the air.
2. The air in our surroundings can hold only a certain amount of vapour.
3. When there is already a large amount of water vapour in the surrounding then it is difficult to add more water vapours to the surrounding.
4. Thus the rate of evaporation decreases with the increase in humidity.

Explanation for the incorrect options: -

(a) Increase in temperature

1. An increase in temperature converts more particles into a vapour state.
2. Thus, the rate of evaporation increases with an increase in temperature.

(b) Increase in wind speed

1. An increase in speed moves the particles away with wind as a result the concentration of vapours decreases in the surrounding.
2. Thus, the rate of evaporation increases with an increase in temperature.

(c) Increase in surface area

1. Surface area is the total area of the exposed surface of a three-dimensional object.
2. If the surface area is increased then the liquid exposed to the surrounding will be more thus more particles converts into the gaseous state.
3. Thus, the rate of evaporation increases with an increase in temperature.

Therefore, option (d) Increase in humidity does not increase the rate of evaporation is correct.