Question

In supermarkets, it is observed that the freezers where frozen foods are kept do not have a lid and yet, the temperature of the freezer remains below 0^oC. How is this possible?

• A. Heat is not radiated to the freezer, as there is a layer of cold air above the freezer
• B. The cold air is denser and does not rise out of the freezer
• C. Conduction of cold air away from the freezer is slow, as the surrounding temperature is low
• D. The air-conditioned environment at the supermarket helps the freezers to remain cold

Answer 1

The correct option is B

The cold air is denser and does not rise out of the freezer

The cold air is denser and does not rise out of the freezer and hence the temperature of the freezer remains below 0^oC.