Which of the following gas is used for cooling in refrigerator

Chlorofluorocarbon or CFC is used as a refrigerant in older refrigerators for cooling by absorbing heat. Nitrogen and Helium are not typically used for this. CFCs were phased out due to ozone depletion replaced by HFCs. Refrigeration involves compression and expansion cycles to cool air. Understanding refrigerants is important for environmental science and appliance technology highlighting impacts on climate change and alternatives like hydrofluoroolefins for sustainable cooling.