Divers Snorkel
why is it so difficult to breathe when snorkeling at a depth of 1 m, & practically impossible @ depth of 2m?
Why can't a diver simply breathe through a hose that extends to the surface?
Because the air inside the hose is at atmospheric pressure and water is dense enough that one is trying to expand ones lungs against a much higher pressure of water, especially since the lungs are designed more to compress and blow out and are poor at sucking in against pressure anyway.
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