The triple point temperature is the unique temperature (and corresponding pressure) at which all three phases of a substance coexist in thermodynamic equilibrium. For example, pure methane—the primary component of natural gas—has a triple point at approximately 90.7 K and 0.117 bar. Knowing this point allows engineers to predict when phase transitions will occur during gas cooling, liquefaction, or pressure reduction. https://www.kaitiangas.com/