What does the triple point on the phase diagram of water represent?

1 Answer
Jun 21, 2016

The conditions of temperature and pressure when ALL three phases of water are in equilibrium.


Clearly this is an empirical phenomenon, and also clearly, this represents unusual, non-standard conditions. The phase diagram of water is highly unusual in that the solid-liquid phase boundary has a negative slope. For more information on why this is unusual, see here.