Question

Which of the following factor reduces the rate of evaporation?

• A. Humidity
• B. Surface area
• C. Temperature
• D. Wind speed

Answer 1

The correct option is A Humidity

Evaporation is a process where liquid converts to its gaseous state below its boiling point. It is a surface phenomenon.

The factors affecting evaporation are:
$\bullet$ Surface area - The increase in surface area increases the rate of evaporation. This is because more particles will be exposed to the surrounding and will easily form vapours.

$\bullet$ Temperature - With the increase in temperature, the movement of the liquid particles increases, which helps them to easily escape from the surface and form vapours. Thus, evaporation increases.

$\bullet$ Humidity - If the humidity (water vapour) in the air is more, it becomes difficult for the other water particles from any surface to enter into the atmosphere. Thus, it decreases the rate of evaporation.

$\bullet$ Wind speed - With the increase in wind speed, the evaporation increases. This is because the liquid particles easily convert into the gaseous state.