What's phase diagram?
The phase diagram is a pressure vs temperature sketch. On the graph, the different physical states of any system at variable temperature and pressure are shown.
What's a Triple point?
A triple point is the point on a phase diagram where all three states of a system (solid, liquid, and gas) are in equilibrium.
What's a Critical point?
A critical point is that point on the phase diagram where the boundary between the liquid phase and gaseous phase vanishes away.
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