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phase diagram
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Phase equilibria for the solid, liquid and vapour states of a substance Figure 1: Phase diagram of argon. phase diagrams of helium-3 and helium-4 Iron-carbon equilibrium diagram.
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phase diagram

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Also known as: constitutional diagram, stability diagram
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phase diagram, graph showing the limiting conditions for solid, liquid, and gaseous phases of a single substance or of a mixture of substances while undergoing changes in pressure and temperature or in some other combination of variables, such as solubility and temperature. The Figure shows a typical phase diagram for a one-component system (i.e., one consisting of a single pure substance), the curves having been obtained from measurements made at various pressures and temperatures. At any point in the areas separated by the curves, the pressure and temperature allow only one phase (solid, liquid, or gas) to exist, and changes ...(100 of 348 words)

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