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Question
Cold storage rooms are built with thick walls of hollow bricks that trap air inside. What is the main reason for this construction choice?
Options
To make the walls heavier
To increase heat flow
To create convection currents
To reduce heat flow because trapped air is a poor conductor
MCQ
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Solution
To reduce heat flow because trapped air is a poor conductor
Explanation:
Air trapped in hollow bricks acts as an insulator and reduces heat entering the cold room.
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