Definitions for "Phase diagram"
A two-dimensional graph that shows the state, or phase, of a substance at any combination of temperature and pressure.
phase map. A map that shows which phases of a sample are most stable for a given set of conditions. Phases are depicted as regions on the map; the borderlines between regions correspond to conditions where the phases can coexist in equilibrium.
Graphical representation of temperature phases in an alloy. A tin/lead phase diagram (that is, solder) shows solidus and liquidus temperatures for a range of tin/lead proportions.
Keywords:  matter, display, substance, way, useful
a useful way to display the states of matter for some substance