Conceptual Physics (12th Edition)

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

Chapter 15 - Think and Explain - Page 299-300: 84


When the thermometer is suddenly warmed, the outside (glass) is heated before the inside (mercury). The glass is the first to expand, enlarging the width and height of the opening. The mercury level in the tube momentarily drops into the bulb at the bottom. After the mercury's temperature catches up to that of the glass, it rises in the glass tube because of its greater expansion coefficient.
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