What is the triple point of water?

A. 271 K
B. 272.2 K
C. 273.16 K 
D. None of these

Explanation:

The single combination of pressure and temperature at which pure water, pure ice, and pure water vapour can coexist in a stable equilibrium occurs at exactly 273.16 kelvins (0.01 °C) and a pressure of 611.73 pascals (ca. 6.1173 millibars, 0.0060373057 atm).

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