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Engraving of the Atlas compression ice making machine, an early refrigeration unit. The use of refrigeration in industry began during 1851 at Bendigo in Victoria, Australia. Refrigerators work by using the heat in an object located in a refrigeration chamber to boil a liquid in a pipe. This newly-made gas is then removed and compressed. Under compression the gas becomes a liquid again and releases heat which is lost to its surroundings. The liquid is then pumped back towards the refrigeration chamber to begin the cycle again. Image taken from The Industries of the World (1881).
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