Conceptual Physics (12th Edition)

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

Chapter 15 - Think and Explain: 87

Answer

If the metal leads penetrate the glass, they must have similar thermal expansion coefficients. If the heated metal expands faster than the heated glass, the lead may crack the glass. If the metal expands more slowly than the glass, the airtight seal around the lead may be compromised.
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