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The molecules of water are not all at the same temperature*.
Thanks SC - so only "fractionally" warmer, then? I guess that there are always water molecules evaporating from the surface, and as the temperature difference increases favourably for the water, then there is a greater rate of evaporation. So it is unlikely to occur when the water temp. is lower than the air temp.?
To be pedantic, it's fog not steam. Steam is invisible.
I see I'm not that old yet