Chemistry: The Central Science (13th Edition)

Published by Prentice Hall
ISBN 10: 0321910419
ISBN 13: 978-0-32191-041-7

Chapter 1 - Introduction: Matter and Measurement - Exercises - Page 34: 1.7b


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Work Step by Step

This question deals with reading a speedometer and determing sig figs. The speedometer has readings in both miles per hour (mph) and kilometers per hour (km/h) The speed indicated in the outer ring is 115 km/hr, which has three sig figs. The speed indicated in the inner ring is 72 mph, which has two sig figs. This difference is created by the fact that the km/h ring has more precise markings. The more precise your measurement, the more sig figs you can have.
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