Solid water (ice) is slowly warmed from a very low temperature.
a) What minimum external pressure p must be applied to the solid if a melting phase transition is to be observed? Describe the sequence of phase transitions that occur if the applied pressure p is such that p<p1p<p1.
b) Above a certain maximum pressure p2p2, no boiling transition is observed.
What is this pressure? Describe the sequence of phase transitions that occur if p1<p<p2p1<p<p2.