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Number of degrees of freedom at a triple point in unary phase diagram is?

A unary phase diagram plots the phase changes of one element as a function of temperature and pressure.

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.?

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

The number of degrees of freedom at a triple point in unary phase diagram is zero.