TODO can anything interesting and deep be said about "why phase transition happens?" physics.stackexchange.com/questions/29128/what-causes-a-phase-transition on Physics Stack Exchange
This is the most classical type of phase diagram, widely used when considering a substance at a fixed composition.
Composition phase diagrams are phase diagrams that also consider variations in composition of a mixture. The most classic of such diagrams are temperature-composition phase diagrams for binary alloys.
The more familiar transitions we are familiar with like liquid water into solid water happen at constant temperature.
However, other types of phase transitions we are less familiar in our daily lives happen across a continuum of such "state variables", notably:
- superfluidity and its related manifestation, superconductivity
- ferromagnetism
