Question

What is the degree of freedom of a system with 2 phases and 1 component?

(a) 1

(b) 2

(c) 3

(d) 4

The question was posed to me during a job interview.

This intriguing question originated from Gibbs Phase Rule in division Two Phase Gas – Liquid Systems, Phase Rule and Vapor-Liquid Equilibria of Basic Chemical Engineering

Answer 1

Correct answer is (a) 1

To elaborate: F = 2 – 2 + 1 = 1.