Conceptual Physics (12th Edition)

Published by Addison-Wesley
ISBN 10: 0321909100
ISBN 13: 978-0-32190-910-7

Chapter 16 - Think and Explain: 81

Answer

Warm air rises. The air near the ceiling is warmer than that near the wall, so there is a greater difference between inside and outside temperatures at the ceiling. Thicker insulation is installed to slow the loss of heat.
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