Chemistry / Chem 1435 · Atom · ~20 seconds
The Triple Point
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State
A phase diagram's triple point is the single temperature and pressure where solid, liquid, and gas all coexist in equilibrium.
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Freeze-drying holds a frozen sample below its triple-point pressure, so ice sublimes directly to vapor without ever becoming liquid.
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Below the triple point's pressure, no temperature at all permits a liquid state — a structural fact, not a rare condition.