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Air refrigeration cycle is used in

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Refrigeration and Air Conditioning
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Air refrigeration cycle is used in

Answer & Solution
Correct Answer: Option D
The processes are used for scientific, industrial and commercial purposes. Many gases can be put into a liquid state at normal atmospheric pressure by simple cooling; a few, such as carbon dioxide, require pressurization as well.
At ambient pressure the boiling point of liquefied helium is 4.22 K
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