Question

Differentiate between the following:
Absolute humidity and relative humidity.

Answer 1

Absolute humidity is the weight of water vapour per volume of air. The measure of atmospheric humidity varies with expansion or contraction of air, even though the amount of water vapour is constant.

On the other hand, relative humidity is defined as the ratio of the amount of water vapour in the air to the amount the air can hold at that temperature. In brief, relative humidity is the ratio of air's water vapour content to its water vapour capacity.