If my cylinder of air lasts 60 minutes while i am at the surface breathing normally, assuming all else is the same, how long will it last at 20 metres/66 feet breathing normally?

Question

Physics

Carly Dougherty

5 August, 20:14

If my cylinder of air lasts 60 minutes while i am at the surface breathing normally, assuming all else is the same, how long will it last at 20 metres/66 feet breathing normally?

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Answers (1)

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Joy Khan · Answer 1

As you descend, the pressure of the air increases and the volume of the air decreases as it becomes squeezed by the pressure.

The ratio is 1/pressure.

At 20 meters below the surface, the pressure of the air is 3 atm.

Time that oxygen tank can last = 1/3 x 60 = 20 minutes