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What is the degree of freedom at the triple point of water? 

What is the degree of freedom at the triple point of water?  Correct Answer Zero

Concept:

Triple point: The temperature and pressure at which the solid, liquid, and vapor phase of a pure substance coexists in equilibrium are called the triple point.​

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  • At a pressure below the triple point line, the substance cannot exist in the liquid phase, and the substance when heated transforms from solid to vapor by absorbing the latent heat of sublimation from the 

Gibb's phase rule is given by;

P + F = C + 2

where, P = No of phase, F = Degree of freedom, C = No of  components

Calculation:

Given:

For pure substance (C) = 1, At triple point (P) = 3

3 + F = 1 + 2

F = 0

Hence the degree of freedom will be Zero at the triple point of water.

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