Here are some numbers: the evaporation enthalpy of water is 2,260 kJ/kg at room temperature. The specific heat of water is 4.2 kJ/(kg*K). So for a given amount

Here are some numbers: the evaporation enthalpy of water is 2,260 kJ/kg at room temperature. The specific heat of water is 4.2 kJ/(kg*K). So for a given amount of water, the evaporation is "worth" about 500 Kelvin of cooling in terms of energy absorbed.