Question

The point in the phase diagram where the fusion curve, the vapor pressure curve, and the sublimation curve join is called the

A) double point.
B) critical point.
C) boiling point.
D) melting point.
E) triple point.

Answer 1

The point in the phase diagram where the fusion curve, the vapor pressure curve, and the sublimation curve join is called the triple point. It is the only combination of temperature and pressure at which all three phases (solid, liquid, and gas) are in equilibrium and can exist simultaneously.

Step-by-step explanation:

The point in the phase diagram where the fusion curve, the vapor pressure curve, and the sublimation curve join is called the triple point. This is the only combination of temperature and pressure at which all three phases (solid, liquid, and gas) are in equilibrium and can exist simultaneously. It represents the point of intersection of the three curves on the phase diagram.