triple point

Definition

The unique temperature and pressure at which the solid, liquid and gas phases of a substance are all in equilibrium.

Example Sentences

• "A solid sublimes only when the pressure of its vapor is below that of the triple point for that substance."
• "When the incident shock wave is at position “a” the second triple point, T, is still inside the zone where the vibrational degree of freedom has not yet reached its equilibrium and the dissociational degree of freedom is still frozen at that position, as its excitation can be assumed to start only after vibrational equilibrium is reached."
• "A triple point may have a convex Mach stem, in which case the SS points upward."