Nitrogen has a triple point at P = 4650 atm and T = 44:5 K, at which state the allotropes, and coexist in equilibrium with one another. At the triple point, V V = 0:043 cm3/mole and V V = 0:165 cm3/mole. Also at the triple point, S S = 4:59 J/K and S S = 1:25 J/K. The state P = 1 atm and T = 36 K lies on the boundary between the …elds of stability of the and phases, and at this state, for the transformation > ,
S = 6:52 J/K and
V = 0:22 cm3/mole. Sketch (to the best your ability with the help of some softwares, e.g., Excel) the phase diagram (P vs. T ) for nitrogen at low temperature.