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RH - is just that, "relative" humidty. It is a measure of how much moisture is in the air relative to the maximum it can hold. Dew Point is a better way to look at how much moisture is around in absolute terms. Dew Point is a meaure of the partial pressure of moisture in the air. How quickly we forget our chemistry!
45 dry bulb (air temp) and 29 Dew point would be 42% RH, H20 PP .08 psi
70 dry bulb (air temp) and 50 Dew point would be 40% RH, H20 pp .178 psi
70 dry bulb (air temp) and 59 Dew point would be 61% RH, H20 pp .251 psi
So 40% RH inside your house at say 70 F is very different that 40% RH if the outside temp is 45 F. It will have more than twice the moisture.
If the temp in the room was constant, and the RH rose from 40% to 60%, there is moisture coming from somewhere, and a lot of it. It means that the amount of moisture in the air rose by 50% in a matter of hours. Keep looking for the source.
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James
The pessimist complains about the wind; the optimist expects it to change; the engineer adjusts the sails.- William Arthur Ward (1921-1994)
Red-beard for President, 2020
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