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12-13-2007, 11:14 AM #11
Senior Member
powdery mildew?
Exactly.
Originally Posted by BlaZinROC
%RH depends on two variables: Temperature and actual mass of water per volume of air.
Warm air can hold a much higher mass of water vapor than cold air.
The dew point, at which condensation occurs (dew), is the temperature at which the air can no longer hold the same mass of water vapor, and some will condense out of the air and fall or stick to surfaces, especially surfaces that are colder than the surrounding air. Well, the water doesn't really care where it goes, but cold surfaces (like the side of a glass of frozen beveraes) are the first place you will notice that condensation is occurring.
Anyway, the short version is, that when you increase the heat, you increase the air's water holding capacity and decrease the condensation on your leaves.
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