The gas used in a refrigerator to cool water is___________?
- A. Nitrogen
- B. Carbon dioxide
- C. Methane
- D. Tetrafluoroethane
Explanation
Tetrafluoroethane is a refrigerant used in many modern refrigerators and air-conditioning systems because it absorbs heat during evaporation. Nitrogen, carbon dioxide and methane are not the usual answer for this appliance.