I gotta know how my ice cream stays cold
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A refrigerator contains two long tubes, or coils thru which a substance (refrigerant) is circulated by means of a compressor pump. In one of them (the evaporator coil) the refrigerant is passed thru a small hole into a wider section of the tube. The rapid expansion causes the refrigerant to lose heat, much the way sweat evaporating off your body cools you down. The cold refrigerant is able to pick up heat energy from the inside of the refrigerator box and carry it away from your food. The warmed refrigerant is then circulated to another coil on the outside of the box (the condenser) where this heat is released into the room or outside air.
A refrigerator, an air conditioner and a dehumidifier all use essentially the same mechanism to move heat from one place to another.
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