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Determining Relative Humidity

Relative humidity is a ratio or the "relative" amount of moisture in the air, as compared to the maximum amount of moisture the air can hold at that temperature. For example, air with a relative humidity of 50% contains one half the amount of moisture the air can hold at that temperature. Warmer air can hold more moisture than colder air, so when air is warmed, its relative humidity decreases. Air a 70 degrees and 50% RH will have a RH of only 25% when heated to 90 degrees. Conversely, the 70 degree, 50% RH air will have a 100% relative humidity when cooled to 50 degrees. The following chart show the changes in relative humidity as 90 degree/ 50% RH air is cooled. At about 76 degrees, the RH becomes 80%, allowing mold to grow. At about 69 degrees, condensation starts to form.

  

 

 

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Spalding Computer Services
Last Update: 02/02/2002