Question

why humidity is inversely proportional to evaporation

Answer 1

as cold air has less capacity to hold water vapour then hot air the rate of evaporation of water from the waste cloth will be slow to humidity is inversely proportional to the rate of evaporation ....if humidity is high evaporation is low ...hi you made it means the air has already high moisture content

Answer 2

The rate of evaporation at a given place is always dependent on the humidity of that place because if the air is already filled with water vapor, it will not have any place to hold excess vapor and therefore, evaporation will occur at an extremely slow rate.

Let us consider an example. If you take two wet cloths and hang one cloth in ample sunlight while the other in a shaded area, which one of the two will dry faster? It will be the one that is in the sunlight because the air in that area is hot and the humidity is low. It will have more capacity to hold water vapor and thus the rate of evaporation will be faster. On the other hand, the cloth in the shaded area is surrounded by air that is cooler. As cold air has less capacity to hold water vapor than hot air, the rate of evaporation of water from the wet cloth will be slower too.