Refrigeration and Air Conditioning
If a gas is to be liquefied, its temperature must be

None of these
Equal to critical temperature
Increased to a value above its critical temperature
Reduced to a value below its critical temperature

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Refrigeration and Air Conditioning
A refrigeration system

Rejects energy to a low temperature body
None of the listed here
Removes heat from a high temperature body and delivers it to a low temperature body
Removes heat from a low temperature body and delivers it to a high temperature body

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