Question

How is Gibb’s phase rule defined?

(a) C+P+1

(b) C+P+2

(c) C-P+2

(d) C-P

This question was addressed to me by my college professor while I was bunking the class.

My question is from Phases and Phase Diagrams topic in division Constitution of Alloys and Phase Diagrams of Engineering Material & Metallurgy

Answer 1

Correct choice is (c) C-P+2

The best I can explain: The number of phases present in an alloy depends on the number of elements of which it is composed. The Gibb’s phase rule is given by the equation F = C – P + 2. Here, F is the degrees of freedom, C is the number of components, and P is the number of phases.