Conceptual Physics (12th Edition)

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

Chapter 16 - Think and Discuss: 84

Answer

The foil keeps the potatoes hot after being removed from the oven. Radiation from the potatoes is reflected back to them. Also, the plate and air don't make direct contact with the potato skin, which decreases heat loss due to conduction. The foil also holds in steam, which keeps the potatoes warm and moist.
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