Absorption refrigerators and the more common mechanical refrigerators both cool by the evaporation of refrigerant . ( Evaporation of a liquid causes cooling, as for example, liquid sweat on the skin evaporating feels cool, and the reverse process releases lots of heat . ) In absorption refrigerators, the buildup of pressure due to evaporation of refrigerant is relieved not by suction at the inlet of a compressor, but by absorption into an absorptive medium ( water in the case of the Icy Ball ).
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