The freezer in a single compartment refrigerator is generally mounted on the top for proper cooling. Which of the following property of air is demonstrated by this?

The cold air settles down

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The hot air settles down.

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The low temperature causes uniform cooling.

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None of the above

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Solution

The correct option is A The cold air settles down
The air in the freezer is colder than the rest of refrigerator. Since, the cold air is denser, it sinks down and warm air is forced to rise up. This warm air gets cooled in the freezer and follows the same cycle. This is the principle for the uniform cooling of a single compartment refrigerator. Hence, the freezer in a single compartment refrigerator is generally mounted on the top.

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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?

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