Conceptual Physics (12th Edition)

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

Chapter 14 - Think and Explain: 69


Less. More.

Work Step by Step

The buoyant forces on the identical bottles are the same (because they displace the same amount of air), so any weight differences are attributed to the contents. Helium is less dense than air, and weighs less than an equal volume of air at the same pressure. A bottle of helium weighs more than an evacuated bottle because it has more mass.
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