When we breathe, we expand the volume of our chest cavity, reducing the pressure on the outer surface of the lungs to less than 1 atm (Boyles law). Because of this pressure differential, the lungs expand, the pressure in them falls , and air from outside our lungs then flows into them. Extra-long snorkels do not work because of the pressure exerted by water at an increased depth.
Why is it impossible to breathe air through an extra-long snorkel (longer than a couple of meters) while swimming under water?
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