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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.
It would be difficult to find a more important process in our weather and climate system than evaporation. Evaporation is the change of water from a liquid to a gas. Water is continuously evaporating from the surface of the Earth, literally pumping more and more water vapor into the atmosphere. Averaged across the entire Earth, water evaporates from the surface at a rate of about 3 millimeters per day (about 1/8 of an inch).