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As humidity is dependent on temperature, wind and other factors, these factors affect evaporation too. There are a multitude of factors, including relative humidity, that govern the process of evaporation whether it is occurring at a small laboratory or over the surface of a huge water body like a lake or ocean.
Water is pumped up and poured onto a specialized cooling pad that has warm air blown through it by a high-powered fan. The water absorbs the heat and evaporates and cool air gets blown out the other side. The rate of evaporation is inversely proportional to the humidity of the surrounding area.