Many people have imagined that if they were to float the top of a flexible snork

Question

Many people have imagined that if they were to float the top of a flexible snorkel tube out of the water, they would be able to breathe through it while walking underwater. However, they generally do not consider just how much water pressure opposes the expansion of the chest and the inflation of the lungs. Suppose you can barely breathe while lying on the floor with a 360 N weight on your chest. How far below the surface of the water could your chest be for you to still be able to breathe, assuming your chest has a frontal area of 0.090 m2?

Explanation / Answer

Here ,

force on the lungs , F = 360 N

area ,A = 0.090 m^2

Pressure acting on chest , P = Force/area

P = 360/0.090 Pa

P = 4000 Pa

let the depth is d

as p * g * h = P

1000 * 9.8 * h = 4000

h = 0.41 m

the person can barely breathe at 0.41 m depth

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