Triple point of water exists at 0.01 C and at 4.38 Torr. My question is how would vapour phase coexist at 0.01 C?

Dear Varun,

The temperature and pressure at which a substance can exist in equilibrium in the liquid, solid, and gaseous states. The triple point of pure water is at 0.01 degrees Celsius and 4.58 millimeters of mercury and is used to calibrate thermometers.

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