Refrigerant R134A: Notes
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Vehicle air conditioning systems make use of the vaporization and condensation process. In this case, one works with a substance which boils easily, designated 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 slightly to the ambient pressure).