I'm merely starting to research this field. Phase transitions have always been a mystery for me. Which kinds of dynamics govern when a material will undergo a phase transition? e.g., why is it exactly at the temperature T0 and pressure p0 that the substance X goes from one phase to the other? Typically it would seem like the ΔT/ΔU is zero during phase change. Why is this? Is it consistent with the 2nd law? Somehow my intuition tells me that heating a substance should increase its temperature - but it has been a long time since I studied the actual thermodynamic equations. And finally, and most important, do YOU know any good introductory texts in this topic that you woud recommend?