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Below the critical temperature a cubic equation of state gives three real roots for volume. The correct interpretation is that

  • A.only the middle root carries any physical meaning at all
  • B.the largest is the vapour and the smallest the liquid
  • C.all three roots are physically meaningful states of the fluid
  • D.the middle root is the saturated liquid at that pressure

Answer: B

The middle root lies on a branch where volume increases with pressure, which is mechanically unstable and cannot be realised. The two outer roots are the saturated phases at that pressure. Their difference vanishes as the critical point is approached.

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