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The compressibility factor is defined as

  • A.the reciprocal of the isothermal compressibility of the fluid
  • B.the ratio of the two specific heats of the fluid concerned
  • C.the actual molar volume divided by the ideal gas molar volume
  • D.the ratio of the pressure to the critical pressure of the fluid

Answer: C

Written as pressure times volume over the gas constant and temperature, it measures how far a gas departs from ideality at the conditions given. Values below one mean attraction dominates and above one that repulsion does.

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