Editing Heat transfer (section)

====Evaporative cooling====
[[File:Air cooler.jpg|upright|thumb|A traditional air cooler in [[Mirzapur]], [[Uttar Pradesh]], [[India]]]]
[[Evaporative cooling]] happens when water vapor is added to the surrounding air. The energy needed to evaporate the water is taken from the air in the form of sensible heat and converted into latent heat, while the air remains at a constant [[enthalpy]]. Latent heat describes the amount of heat that is needed to evaporate the liquid; this heat comes from the liquid itself and the surrounding gas and surfaces. The greater the difference between the two temperatures, the greater the evaporative cooling effect. When the temperatures are the same, no net evaporation of water in the air occurs; thus, there is no cooling effect.