Question

1) define humidity. How does it affect evaporation?

Answer 1

The amount of water particles present in air is known as humidity.
                     Humidity is indirectly proportional to evaporation. The rate of evaporation decreases if the humidity is high.

comment if u have doubts.

Answer 2

The amount of water vapours present in the atmosphere is referred to as HuMiDiTy............................ For water, higher humidity decreases evaporation because more water is present in the atmosphere. Less water will diffuse into the atmosphere. If it's at 100% humidity, there's no net evaporation.... So in this way it affects evaporation....