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The principle of corresponding states asserts that

  • A.all fluids behave alike at the same reduced conditions
  • B.all fluids have the same critical compressibility factor of one
  • C.reduced properties are equal to critical properties
  • D.the equation of state is the same for every fluid at every condition

Answer: A

Correct answer: all fluids behave alike at the same reduced conditions

The principle states that the compressibility factor is approximately a universal function of reduced temperature and reduced pressure, so a chart built from one fluid can be used for another. It is an approximation rather than a law, and it is best for small non-polar molecules - the limitation the acentric factor was introduced to address.

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