Refrigerant R134A: Notes
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A/C systems in vehicles utilize the vaporization and condensation process. Thus one must work with a substance that boils easily, which is described here as refrigerant.
The refrigerant used is tetrafluoroethane R134a, which boils at -26.5 °C (-15.7 °F) at a vapor pressure of "1 bar (14.5 psi)" (absolute pressure corresponds approximately to the ambient pressure).