Discussion
The Gibbs phase rule is stated as
Answer: A
Correct answer: \( F = C - P + 2 \)
Degrees of freedom equal components minus phases plus two, the two being temperature and pressure. Every consequence in the subject follows from it: since \( F \) cannot be negative, \( P \le C + 2 \), which is why a one-component system can have at most three phases in equilibrium and no more.
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