Refrigerant is a substance used in a refrigeration system to transfer heat and cool the air.
Refrigerant
Constantly circulating in the refrigeration system and through its own state.
Common refrigerants used to achieve refrigeration include:
Ammonia (R717)
Freon (R11, R12, R113, R114, R115, R500, R502, etc.)
R134a, R404, R410a refrigerants.