The human lungs can function satisfactorily up to a limit

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The human lungs can function satisfactorily up to a limit where the pressure dissimilarity between the inside and outside of the lungs is 1/19 of an atmosphere. If a diver uses a snorkel for breathing, how far below the water can she swim? Suppose the diver is in salt water whose density is 1047 kg/m3.

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