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| | Phase diagram - Wikipedia, the free encyclopedia |
 | | For a phase diagram with temperature on the vertical axis, a solidus is a line below which the substance is stable in the solid state. |
 | | In physical chemistry and materials science, a phase diagram is a type of graph used to show the equilibrium conditions between the thermodynamically-distinct phases. |
 | | A triple point is, in a pressure-temperature phase diagram, the unique intersection of the lines of equilibrium between three states of matter, usually solid, liquid, and gas. |
| www.wikipedia.org /wiki/Phase_diagram (694 words) |
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