# Homework Help: Pressure and density in swimming.

1. Oct 22, 2011

### haleyy89

1. The problem statement, all variables and given/known data
The human lungs can function satisfactorily up to a limit where the pressure difference between the outside and inside of the lungs is 1/21 of an atmosphere. If a diver uses a snorkel for breathing, how far below the water can she swim? Assume the diver is in salt water whose density is 1042 kg/m3.

2. Relevant equations

3. The attempt at a solution
I think pgh, where p is density, g is gravitational acceleration, and h would be the height. I think the height would tell you how far the swimmer could go below water. I'm honestly not exactly sure where to start this one!

Last edited: Oct 22, 2011
2. Oct 22, 2011

### QuarkCharmer

That pressure has to be equal to 1/21 atm right? Remember the units are going to be different and account for that.

3. Oct 23, 2011

### haleyy89

I converted the 1/21 atm to 4824 Pascals. I am still not sure how to find the height below the water the swimmer can go though?

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