What is the degree of freedom for a system comprising liquid water equilibrium with its vapour ?
Correct answer: B. 1
- A. 0
- B. 1
- C. 2
- D. 3
Explanation
Applying the phase rule, F = C − P + 2 = 1 − 2 + 2 = 1. Thus, fixing either temperature or pressure fixes the other along the liquid-vapour equilibrium curve.
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