Leo's Tech Help: Relative Humidity
Relative humidity is the percent of moisture in the air relative to the moisture the air can hold at a specific temperature. When you see 50 percent RH it means that the air holds 50 percent of the moisture that it is possible to hold at that temperature.
The higher the air temperature, the more moisture it can hold. This means that air at a temperature of 80°F and 50 percent RH holds more grains of moisture than the same amount of air at a temperature of 60° and 50 percent RH.
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Publication date: 07/10/2006