Question

State reasons:
Temperature of water remains constant during boiling.
Increase in humidity in air decreases the rate of evaporation.

Answer 1

Water starts boiling at 100°C temperature. After attaining that temperature, even with the supply of heat, there will be no rise in the temperature. All the heat that is supplied is utilized by the molecules of water to overcome the force of attraction between them and change into vapour.

Generally, when temperature andhumidity are constant, and wind speed increases, the rate of evaporation increases as well. ... When wind speedand humidity stay constant, and temperature increases, then the rate of evaporation will increase because warmer air can hold more water vapor than colder air.

Answer 2

when boiling starts the more energetic molecule change to a gas spread out and forms a bubble in addition gas molecules leaving the liquid take away heat energy and the temperature of water remains constant

when temperature and wind speed are constant and humidity increase so the rate of evaporation decrease wind wind speed and humidity is stay constant and temperature increase so the rate of evaporation also increase because warmer air can hold more water vapours then cold air.