Why is it so difficult to breathe when snorkeling at a depth of 1 m and practically

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Why is it so difficult to breathe when snorkeling at a depth of 1 m and practically impossible at a 2-m depth? Why can't a diver simply breathe through a hose that extends to the surface?
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Conceptual Physics

ISBN: 978-0321568090

11th edition

Authors: Paul G. Hewitt

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