Question

What is the meaning of "triple point", in case of ice?

Answer 1

Ice has three points 
The single combination of pressure and temperature at which liquid water, solid ice, and water vapor can coexist in a stable equilibrium occurs at exactly 273.16 K (0.01 °C; 32.02 °F) and a partial vapor pressure of 611.657 pascals (6.11657 mbar; 0.00603659 atm).

Answer 2

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HERE IS YOUR ANSWER,


⇔ Well the Triple Point of water is :

→ 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°C and 4.58 mm of Hg and is used to calibrate thermometers.


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