Answer
Long steam pipes undergo frequent and extreme temperature changes. The bends in the pipe allow for extreme changes in expansion and subsequent contraction, without too much movement on the ends of the pipe where it makes other connections.
Conceptual Physics (12th Edition)
by Hewitt, Paul G.
Published by
Addison-Wesley
ISBN 10:
0321909100
ISBN 13:
978-0-32190-910-7
Chapter 15 - Think and Explain - Page 299-300: 85
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