Phase Transitions
Handout 3 on Phase Transitions
Phase Diagram of Water
Source: Triple Point of Water
In fact, the above picture is not quite correct as it is meant to illustrate the triple point. Water has several crystalline phases and hence the solid(ice) phase actually consists of several phases.1
Source: The many phases of ice
Somendra M. Bhattacharjee (Inst. of Physics, Bhubaneswar) has written a very nice article on phase transitions titled:
Critical Phenomena: An Introduction from a modern perspective.
I strongly recommend Section I-IV and possibly V — the rest of the article is at a higher level.