Why does putting a wet paper towel around a can in the freezer cool it so fast?
In: Physics
As /u/Alexis_J_M comment has already explained, it does cooling by evaporation.
There is one more factor: A fridge contains quite dry air, because water in the air would freeze out. The dryness makes the water from the towel to evaporate faster. Evaporation needs heat, and the heat is taken from the can.
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