Conceptual Physics (12th Edition)

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

Chapter 15 - Think and Explain: 86

Answer

Thin glass is used because when the filament turns on, it heats up to thousands of degrees in less than a second. A thin layer of glass has low heat capacity and heats up all at once. If the glass were thick, the inside surface would heat up before the outside, and the greater expansion on the inner surface might fracture the glass.
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