Chemistry 9th Edition

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

Chapter 5 - Gases - Active Learning Questions - Page 233: 11


Helium is less dense than air and therefore rises. When it rises to high altitudes, the pressure inside the balloon is greater than the atmospheric pressure which causes the balloon to pop.

Work Step by Step

Because helium is lighter than air, a helium balloon is able to rise through the air towards higher altitudes. However, at higher altitudes, the atmospheric pressure is significantly weaker. Therefore, when the pressure of the helium gas exceeds the atmospheric pressure, the balloon pops.
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