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What do you understand by ‘triple point’...

What do you understand by ‘triple point’ of a substance?

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Triple point of a substance represents the conditions at which all the three phases of the substance, i.e., solid, liquid and gas exist together, e.g., triple point of water is `0.01^(@)C` at 4.58 mm pressure where ice, liquid water and water vapour coexist.
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