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triple point


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The point on a phase diagram at which planes or phases meet. This is the temperature and pressure at which the three phases (solid, liquid, and gas) of a substance can coexist (see also kelvin scale). In a solid-solution system, the triple point is usually defined by the original pressure and temperature conditions at which the solid, liquid, and gaseous phases of a substance are in equilibrium.

Subjects: Earth Sciences and Geography.


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