The phase rule states that F = C − P + 2. ... With one component and two phases—liquid and vapour, for example—only one degree of freedom exists, and there is one pressure for each temperature.

What is a component in phase rule?

In thermodynamics, a component is one of a collection of chemically-independent constituents of a system. ... Calculating the number of components in a system is necessary when applying Gibbs' phase rule in determination of the number of degrees of freedom of a system.

Which Gibbs phase rule is applicable to a two component system?

A system that must have two intensive properties specified is a system with two degrees of freedom. Another example is a pure substance that has two phases in equilibrium, such as saturated liquid and vapor. The number of phases in this case is Π = 2, and the number of the components is N=1.