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A system with zero degrees of freedom is described as

  • A.metastable
  • B.invariant
  • C.univariant
  • D.bivariant

Answer: B

Correct answer: invariant

With \( F = 0 \) nothing can be varied without a phase disappearing, so the state is fixed at a single point on the diagram. The triple point of water is the standard example, and its invariance is exactly why it served as a defining fixed point of the temperature scale.

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