Question: Plot the phase diagram (p-T) for the following refrigerants for a temperature range from 40oC to the critical temperature: (a) R-134a. (b) R-12. (c) NH3.

Plot the phase diagram (p-T) for the following refrigerants for a temperature range from 40oC to the critical temperature:
(a) R-134a.
(b) R-12.
(c) NH3. Use a log scale for pressure and linear scale for temperature.

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