The triple point of a substance gas is
A)the temperature above which the gas cannot be liquefied.
B)the temperature at which solid,liquid,and gas coexist.
C)the temperature below which the gas cannot exist as a liquid.
D)the temperature at which the gas has a maximum volume.
E)the temperature above which there is not distinction between liquid and solid.

Question

Quizplus · Accepted Answer

The triple point of a substance gas is the temperature and pressure at which all three phases (solid, liquid, and gas) can coexist in equilibrium. It is a unique point for each substance where the vapor pressure, melting point, and boiling point all meet at the same time. Therefore, option B is the correct answer.

The Triple Point of a Substance Gas Is