Q.59 The given P-T diagram shows the relative stability ranges of andalusite, sillimanite and kyanite. The difference in degrees of freedom at points X and Y 1s 12 X Kyanite Sillimanite Y Andalusite 200 400 600 800 T (°C)
Answer: 2
Degree of freedom at point X = 2 (Bivarient point)
Degree of freedom at point Y = 0 (invariant point)
Difference in degree of freedom = 2-0 = 2