Which substance was earlier used as a coolant in refrigerators?
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In the early days, freons were used as a coolant in refrigerators.
Freons were a harmful substance that caused numerous harmful hazards to the ozone layer.
Therefore the refrigerators with freons as a refrigerant were rejected by the health organizations.
Now new coolants are introduced in modern refrigerators.
Freon is the answer to this question.
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