Figuring out PSI at depth...

[JaredWaites]

Mods, sorry if this is in the wrong place or if this has been posted before, I tried to search.

I'm curious what the pressure is on our bodies at depth...is there any information where I can look this up?

Like at say 50 feet how many PSI, 75, 100, etc.

TIA

- Jared

 

[Tigerman]

Mods, sorry if this is in the wrong place or if this has been posted before, I tried to search.

I'm curious what the pressure is on our bodies at depth...is there any information where I can look this up?

Like at say 50 feet how many PSI, 75, 100, etc.

TIA

- Jared

Yes, there is a way to calculate it and it should be in your books.
I cant recall exactly for PSI, but if you go metric and start using BAR or atmospheres aka ATM (atmospheres, for practical use 1 BAR = 1 ATM) every 10m equals 1 additional bar/atm. At the surface youre under 1 bar/atm of pressure, thus at 10m 2 bar, 20m 3 bar and so forth..

 

[JaredWaites]

Its in the OW book...and I should've known it to begin with

I do believe its .5 PSI/foot.

Edit: Thanks

 

[tc]

In Imperial-

Surface- 14.7 psi
33'- 29.4 psi
66'- 44.1 psi
99'- 58.8 psi
132'- 73.5 psi
165'- 88.2 psi


Edit- that's PSIA- absolute

 

[Thalassamania]

about 1/2 psi per foot plus 15

So the pressure at 74 ft is 37+15=52 PSIA or 37 PSIG

 

[JaredWaites]

Thanks.

So a standard air gauge is PSIG, like on a swimming pool air pressure gauge or something in that nature?

 

[tc]

Yep- if you subtract the surface pressure (14.7 psi) from the numbers I listed you get the guage pressure.

 

[JaredWaites]

Cool thanks

 

[ruready7]

Or try (depth in feet divided by 33) times 14.7

 

[Redshift]

Metric is so much easier, isn't it?