Question

the point at which water or another substance may exist simultaneously as a solid, liquid, and gas is
a. triple equilibrium.
b. thermal equilibrium
c. triple point
d. critical point

Explanation:

The triple point is the specific temperature and pressure where a substance can exist in solid, liquid, and gaseous states simultaneously. Triple equilibrium is not the standard term for this concept. Thermal equilibrium refers to a state of no net heat transfer between objects. The critical point is where the liquid and gas phases of a substance become indistinguishable.

Answer:

C. Triple point