Discussion
None of the following is invariant except
Answer: B
Correct answer: the triple point of a one-component system
Invariant means zero degrees of freedom, which requires the maximum number of phases. The triple point has three phases of one component and \( F = 0 \). A point in a single-phase area has two degrees of freedom, a point on the vaporisation curve one, and a point on a binary liquidus one under the reduced rule.
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