Harvey Schneider
Minister of Fire
Here is a very brief explanation of relative humidity. It basically is a measure of how much of the air's capacity to hold moisture has been filled. That capacity changes with temperature.I guess not, I have a digital instrument that measures outside and a few other manual ones that measure inside.
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An example below.
The air has the same amount of moisture in it before and after it is heated. If the air outside at 10 degrees, for example, has 70% relative humidity, when heated, it's capacity to hold moisture increases. Because of that, it's relative humidity drops (to, perhaps 30%). It still contains the same amount of moisture, it's just that it could hold more. It will take that more from wherever it can find it; from the furniture, from house plants or from you.