Paulo needs to use a phase diagram to show how much stable each of the various phases of water is.
The phase diagram could be used to obtain the changes in a substance at different phases of matter. We know that water could exist as solid, liquid or gas. The state in which the water is a function of the pressure and the temperature of the system.
Given that the pressure and the temperature changes of water could be shown on a phase diagram, it then follows that Paulo needs to use a phase diagram to show the various phases of water.
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