Discussion
The triple point of water is invariant because at that point there coexist
Answer: A
Correct answer: three phases of one component
\[ F = 1 - 3 + 2 = 0. \] Ice, water and vapour coexist at one temperature and one pressure only, 273.16 K and 611 Pa. Nothing can be adjusted without losing a phase, which is what makes the point reproducible enough to define a temperature.
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