Conceptual Physics (12th Edition)

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

Chapter 14 - Think and Explain: 53

Answer

The channels between the ridges allow air to escape from the rim of the bottle opening as liquid is poured through the funnel. If the ridges weren't there, air in the bottle would be compressed and it would slow down the flow, or gurgle up through the liquid being poured.
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