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relative humidity

Posted by Harold Kestenholz - Hydronic Network on November 24th, 2001 11:01 PM
In reply to Attic Humidity by C WRIGHT on November 24th, 2001 10:39 PM [Go to top of thread]

Humidity readings are relative; that is, the readings are relative to the temperature. Cold air holds less moisture than warm air, so similar amounts of moisture by weight in 40F air at 80 percent humidity can be 40 percent humidity at 70F.

That is the reason a humidifier is needed in warm air heated homes; outdoor air at 50 percent Rh at zero will become drier than a desert when the outdoor air comes in and is heated to 70F.

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