Chemistry

Question Analysis
This question evaluates the student's understanding of the definition and significance of the triple point on a phase diagram.

Key Concept Explanation
The triple point is a specific temperature and pressure at which a substance can exist simultaneously in all three phases: solid, liquid, and gas.

Step-by-step Solution
1. Recall the definition of the triple point.
2. State that the triple point is the unique temperature and pressure where all three phases coexist in equilibrium.
3. Therefore, the correct answer i...