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Relative Humidity
Relative Humidity is the most commonly used measurment of water vapor in the air. It doesn't actually tell us the amount of water vapor in the air but instead tells us how close the air is to being saturated. The relative humidty (RH) with respect to water is the ratio (expressed as a percentage) of the vapor pressure (e) to the saturation vapor pressure (es).
A relative humidty of more than 100% indicates air that is supersaturated.
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