For R-134a we have a term and definition in Automotive.

The environmentally safe refrigerant now used in air-conditioning systems. It requires a slightly bulkier condenser unit than R-12. Vehicles equipped with R-12 systems can be converted to use R-134a. Since Freon is now banned, expensive and hard to obtain, the conversion may be a good idea when an R-12-based system needs recharging, particularly if technicians detect a leak.
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