Chemistry 9th Edition

Published by Cengage Learning
ISBN 10: 1133611095
ISBN 13: 978-1-13361-109-7

Chapter 5 - Gases - Active Learning Questions - Page 232: 2

Answer

c. Air pressure outside the tube counterbalances the weigh of the mercury in the tube.

Work Step by Step

A barometer is used to observe the atmospheric pressure, not to compare the atmospheric pressure with the pressure of another gas. Therefore, a barometer works by allowing the air pressure to push mercury up the tube until the weight of the mercury equals the air pressure.
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