Which gas is used in refrigerator?

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  3. #ozone
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  6. #layer
  7. #called
  8. #deplete
  9. #europe
  10. #which
  11. #instead
  12. #tetrafluoroethane
  13. #becoming
  14. #refrigerants
  15. #usually
  16. #newer
  17. #modern
  18. #being