Refrigeration and Air Conditioning
Critical temperature is the temperature above which

Water will evaporate
A gas will never liquefy
A gas will immediately liquefy
Water will never evaporate

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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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