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Anyway, while we are debunking myths, wet air is just about as good an insulator as dry air.What changes is the conductivity of the solids in coontact with the air. If there's not much water about then things like cotton and timber are much better insulators than when there is more water.
Air is a mix of gases including water vapour.
graham.dAll correct. BUT air is merely a mixture of gases. Water vapour just happens to be one of them. [...]But should we not try to do better here?Repeat after me - " Air is not a sponge."