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
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.