Tag Archive for Triple point

Triple point

Most substances can exist in a number of phases – solid, liquid and gas, for instance – and exhibit a special condition known as a triple point. As expressed in the Gold Book, published by the International Union of Pure and Applied Chemistry (IUPAC), the triple point occurs when the temperature and pressure of three phases of a substance in a one-component system are in equilibrium. This means that, at a particular combination of temperature and pressure, all three phases can coexist and can be transformed from one to another with the slightest of changes in either temperature or pressure.

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