By looking at a phase diagram of water, what can be assessed?

Question

Quizplus · Accepted Answer

The phase diagram is a graphical representation of the physical states of a substance under varying conditions of temperature and pressure. A typical phase diagram has pressure on the y-axis and temperature on the x-axis. They contain a triple point - the point on a phase diagram at which the three states of matter: gas, liquid, and solid coexist; and a critical point - the point on a phase diagram at which you cannot tell the difference between the liquid and gaseous states of the substance.
Unlike carbon dioxide and most other substances, the phase diagram of water shows a negative slope for the boundary line between the liquid and solid state. This difference has to do with that fact that water actually expands as it goes from the liquid state to the solid state.
You may use the phase diagram for water below as a visual reference.
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By Looking at a Phase Diagram of Water, What Can