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The reduced phase rule is applied to solid-liquid systems because such systems are

  • A.always at exactly one atmosphere
  • B.incapable of forming a vapour phase
  • C.restricted to two phases at most
  • D.almost unaffected by change of pressure

Answer: D

Correct answer: almost unaffected by change of pressure

Solids and liquids are nearly incompressible and their equilibria shift very little with pressure, and the vapour phase is negligible. Pressure can therefore be treated as fixed, which reduces the variables by one and lets the diagram be drawn in two dimensions.

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