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heat is removed from a low-temperature reservoir and transferred to a high-temperature reservoir. the work of heat transfer is traditionally driven by mechanical means, but can also be driven by heat, magnetism , electricity , laser , or other means. refrigeration has many applications, including, but not
chinese empires. however, mechanical refrigeration technology has rapidly evolved in the last century, from ice harvesting to temperature-controlled rail cars. the introduction of refrigerated rail cars contributed to the westward expansion of the united states, allowing settlement in areas that were not...
https://en.wikipedia.org/wiki/Refrigeration