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 :/
In: 0
Relative humidity measures the amount of water vapour currently in air divided by the maximum air can hold before saturating and starting to condense. This saturation concentration increases with temperature. So, what’s happening is that the air can hold more water the hotter it gets, so the relative humidity falls
Latest Answers