Spare Air: some thoughts

[Blackwood]

where does it say 10,000'?

Hint: the pressure at the surface (mean sea level) is about 14.7PSI.

 

[Atomic_Diver]

Hint: the pressure at the surface (mean sea level) is about 14.7PSI.

Ohhhhhh Yeaaa.... My bad....blonde moment

 

[idocsteve]

Hint: the pressure at the surface (mean sea level) is about 14.7PSI.

So what?

If you got 10 PSI at 140 feet, and you're going to double that every atmosphere; and there's about 4 atmospheres between 140 feet and the surface- that 10 psi might be 160 PSI at the surface. There's a couple of breaths in there.

 

[Atomic_Diver]

I fixed it.. It says 30psi now.. But you guys get the idea...

 

[Thalassamania]

So what?

If you got 10 PSI at 140 feet, and you're going to double that every atmosphere; and there's about 4 atmospheres between 140 feet and the surface- that 10 psi might be 160 PSI at the surface. There's a couple of breaths in there.

Err ... Doc, that's 10 psi in a rigid container, it does not increase as you ascend.

 

[Blackwood]

So what?

If you got 10 PSI at 140 feet, and you're going to double that every atmosphere; and there's about 4 atmospheres between 140 feet and the surface- that 10 psi might be 160 PSI at the surface. There's a couple of breaths in there.

Hell, your spare air will probably explode!

I fixed it.. It says 30psi now.. But you guys get the idea...

So now the question becomes: how did you suck your cylinder down to 30PSI at 140feet?

 

[Blackwood]

Err ... Doc, that's 10 psi in a rigid container, it does not increase as you ascend.

I'm crossing my fingers for sarcasm.

 

[Thalassamania]

Not to mix my metaphors but, I'd love to see a Spare Air explode!

 

[idocsteve]

Err ... Doc, that's 10 psi in a rigid container, it does not increase as you ascend.

Oh.

I thought that the measured tank pressure increases as you ascend from depth.

Since you claim that it does not...and for all I know you may be right about this..then why does my AI computer give me "more dive time remaining" as I ascend- and yes it bases that information on the most limiting factor and that in my case is almost always gas remaining not Nitrogen absorption.

 

[Blackwood]

Oh.

I thought that the measured tank pressure increases as you ascend from depth.

Since you claim that it does not...and for all I know you may be right about this..then why does my AI computer give me "more dive time remaining" as I ascend- and yes it bases that information on the most limiting factor and that in my case is almost always gas remaining not Nitrogen absorption.

oh.

Never mind.

http://en.wikipedia.org/wiki/Boyles_law

Amazon.com: Basic Decompression Theory and Application, Second Edition (9781930536142): Bruce R. Wienke: Books