Recently came across the phenomenon that heating a room apparently decreases the humidity. If it was just that heating the space makes a lot of the water condense out of the air, eg onto window panes or other surfaces, then I could accept that. But the bit my brain can’t get around is that if it’s 80% humidity but 2celcius outside, and it’s say 70% humidity and 15celcius inside, why is it helpful to open a window? The warm air inside would be cooled, but surely the water in the air outside would diffuse in and raise the humidity in the room? I feel like I’m missing something really obvious here :/
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We measure humidity by percentage of the maximum, not by absolute water content in the air. If the maximum is higher, then the same amount of water will be a smaller percentage.
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