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Explain the term triple point of the sub...

Explain the term triple point of the substance.

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The temperature and pressure at which the fusion curve, the vapourisation curve and the sublimation curve meet and all the three phases of a substance coexist, is called the triple point of the substance
e.g : Triple point of water is 273.16K under a pressure `6.11xx10^(-3)Nm^(-2)`
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