About the rate of evaporation

Evaporation is the process that the molecule gain enough kinetic energy and be
able of escape from the system. One of the way to add kinetic energy to the system is to heat it. Hence, when you heat the water, rate of evaporation increase, steam will generate.

In an area of less pressure, evaporation happens faster because there is less exertion on the surface keeping the molecules from launching themselves.