Question

When the temperature of air is 30 degree C, its vapour holding capacity is 30.37 gms/cu.m. If the absolute humidity is 18gms/cu.m. then what would be the relative humidity? *

Answer 1

Explanation:

Just a point that leads many astray the air does not have a “vapour-holding capacity”. Water has a propensity to become vapour that rises with a rise in temperature. Air or no air, the amount of water in the vapour phase depends only in temperature. The exact same amount of water will evaporate at a given temperature no matter the atmospheric pressure.

Relative humidity is the actual amount of water vapour divided by the equilibrium amount x 100%

So. 18/30.37 x 100% = 59% relative humidity.