Question

Which substance was earlier used as a coolant in refrigerators?

Answer 1

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.