Conceptual Physics (12th Edition)

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

Chapter 27 - Think and Explain: 65

Answer

The tiny bubbles in the foam predominantly reflect light instead of scattering it (as they would if the bubbles were much smaller).

Work Step by Step

All colors reflect from the small, different-sized bits of liquid in the foam, i.e., the reflection process treats all colors pretty much the same. The result is white foam.
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