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mediumQ. No. 15187-why-do-biscuits-kept-in-a-refrigerator-without-a-cover-become-dry-and-crispy

Why do biscuits kept in a refrigerator without a cover become dry and crispy?

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ACold temperature freezes the moisture in biscuits making them hard
BRefrigerator releases dry chemicals that absorb moisture
CCold dry air inside refrigerator absorbs moisture from biscuits and releases it outside as liquid
DRefrigerator radiation makes biscuits crispy
Correct Answer: Cold dry air inside refrigerator absorbs moisture from biscuits and releases it outside as liquidYour Answer: C

Explanation

This question tests understanding of refrigerator dehumidification and moisture transfer. Freezing moisture inside biscuits would make them hard and icy not crispy in the normal sense. Also the main refrigerator compartment is above 0 degrees C so moisture does not freeze inside the biscuits. The crispiness is due to moisture REMOVAL not freezing. Refrigerators do not release any dry chemicals. They cool air mechanically using a refrigeration cycle. No chemical reactions that absorb moisture occur inside a refrigerator due to chemical release. The air inside a refrigerator is very cold and dry. When soft biscuits containing moisture are placed in this cold dry air the air absorbs the moisture from the biscuits (since refrigerator air has very low humidity). This moisture then condenses on the cold surfaces of the refrigerator (especially the freezer coils) and drips down as liquid water which is drained away. There is no specific radiation from refrigerators that would cause crispiness. The mechanism is purely moisture removal by dry cold air.

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