Question

The number of degrees of freedom available to a two-component system at the eutectic point (at atmospheric pressure) is:

Answer 1

Explanation:

There is only one degree of freedom, so if we assume constant pressure (a typical choice), then all three phases can only be in equilibrium at an invariant point --- the eutectic point!

Answer 2

F=C-P+2 at one atmospheric pressure C=2,P=2 so F=1