Q.

What is Gibbs phase rule for metallurgical system?

A. f = c – 1 – p
B. f = c + 1 – p
C. p + f = c – 2
D. p + f = c + 2
Answer» B. f = c + 1 – p
Explanation: for metallurgical system pressure has no appreciable effect on phase equilibrium and hence, f = c – p + 1.
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