Question

why are the freezer compartment placed at the top of the refrigerator​

Answer 1

Answer:

The freezer which is situated at the top had the lowest temperature compared to other components. So the temperature at the bottom part of the fridge will be really high as compared to the temperature above. So the air at the bottom will be hotter as a result less dense than the air above which is cooler.

Answer 2

Answer:

The freezer which is situated at the top had the lowest temperature compared to other components. ... So the hotter air current from the bottom will rise up to the freezer part and the hot air current gets cooled down due to the freezer.