Chemical Engineering Thermodynamics

A gas can be liquified by pressure alone only, when its temperature is _____ its critical temperature.

  • A. Less than
  • B. More than
  • C. Equal to or higher than
  • D. Less than or equal to
Answer: Option D.

Only below and at the critical point there is strong demarcation in properties of liquids and gases above the critical point we can’t recognize the difference. Hence for a gas which is under or at the critical point can be liquefied. For a gas above critical point can also undergo a pressure change but we can’t notice the difference in properties.

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