If a sample of q that is currently P=0.5atm and T=100K and you increase the temperature to 200K, what phase change have you caused? (a) melting (b)sublimation (c) freezing (d) boiling (e) no phase change, system is at equilibrium throughout heating. The phase diagram starts at 0K and gradually increases from 100k to 200k and as it hits 200K, the line splits apart increasing in pressure