Conceptual Physics (12th Edition)

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

Chapter 23 - Think and Discuss: 108


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Work Step by Step

When a person lies, s/he may sweat, which changes the resistance of the body between the two fingers due to the moist skin. If the person lies, but doesn't perspire while doing so, then the electrical lie detector won't work.
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