What is the degree of freedom for a system comprising liquid water equilibrium with its vapour?

A. 0

B. 1

C. 2

D. 3

Answer: Option B

Solution(By Examveda Team)

Given, vapor-liquid equilibrium :
Number of components \[\left( {{\rm{water}}} \right) = 1\]
Number of phases involved \[\left( {{\rm{vapor - liquid}}} \right) = 2\]
So, degree of freedom :
\[\begin{array}{l} \left( f \right) = C - \emptyset + 2\\ 1 - 2 + 2 = 1 \end{array}\]