Answer :
Paulo needs to use a phase diagram to show how much stable each of the various phases of water is.
What is the phase diagram?
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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