In a proper working bong, the water is about 3C below room temp.Through convection, the water cools the air (the air heats the water). Through evaporation, the air cools the water. This is one of the reasons why you can only get the water a few degrees below room temp.
I measured the exaust air of a bong and it was about 2C below room temp for a bong that was about 3C below room temp.
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