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A fluid held above its critical temperature

  • A.always behaves as an ideal gas
  • B.has an undefined molar volume
  • C.cannot be liquefied by compression alone
  • D.liquefies at a pressure equal to its critical pressure

Answer: C

Correct answer: cannot be liquefied by compression alone

Above the critical temperature no amount of pressure will produce a distinct liquid phase; the fluid simply becomes denser continuously, without any phase boundary appearing. Cooling below the critical temperature is a necessary condition for liquefaction. It also does not behave as an ideal gas - a supercritical fluid can be as dense as a liquid.

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