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Your question is somewhat loaded. Water pressure is determined by the gravitational constant ("g" which is approximately 9.8 m/s^2) and the depth (or height) of the column. So no, changes in atmospheric pressure from increasing altitude do not significantly affect water pressure. However...

You might try looking into the Kid-Stubbs model, which is the basis for the DCIEM tables. It's a serial model (hypothesizes that gas transfers from tissue to tissue). At the very least it would give you a starting point for additional research.

Not only do I bring my own set, I also bring a backup first and second stage and tools in case I have to switch out a something on the primary.

Perhaps we should clarify. What I'm getting at is the physical properties of the tissue don't change based upon pressure. When I say "rate" I mean that the logarithmic function that describes inert gas absorption does not change based upon pressure. Neither perfusion nor diffusion...

I have no objection to splitting the thread to get Dr. Powell's comments. I always value his commentary. Maybe the better analogy is this: a sponge absorbs water at the same rate, regardless of its position in the water column.

I knew I'd draw questions on that statement. Perhaps I can settle the issue with a statement from Bruce Wienke: "halftimes are independent of pressure." The tissue half time determines the rate at which a tissue ongasses or offgasses. Ambient pressure does not affect the tissue half time...

It really isn't a question of question of faster ongassing or offgassing. The rate at which tissues absorb and release inert gas is independent of pressure (it's a logarithmic equation based upon the half time of the tissue, which is really a question of gas solubility and tissue permeability)...

An ounce of prevention is worth a whole mess o' cure. Four words: weights under crotch strap. Problem solved. Or as others have said, minimize your ditchable weight by putting it someplace other than your belt. Or rope your buddy with a loop from your reel. He'll get a kite, and you'll...

SILENCE! You're not supposed to pass on forbidden knowledge. :D

Fortunately DT had really good viz this weekend. Made it easier to avoid idiots on the surface. No opportunity to do that. I was on the shore yelling at the guy to back off.

Good to see that someone is trying to educate folks. Yesterday we had a pontoon boat pull up to our float and start fishing right on top of the bubbles from three of our instructors.

What does Equivalent Nitrogen Depth have to do with this discussion? :D Sound advice from all.

Having recently sneaked a peak at the dollar amount of my purchase history at my LDS, I conclude that I am not a budget diver. But at least now I know why they're so happy to see me when I come in.

No worries; just so long as we are properly feared. :D

I can predict the weather with a great degree of accuracy: sunny and warm. But that's only for Phoenix, Arizona and Death Valley. And Kuwait. And since Al Gore invented the Internet, you should not be surprised that he can predict future weather. I also heard that the weather changes to...

+5 to the OP for asking the question. -1 to the OP for buying a Spare Air. I applaud the OP for actually THINKING about something and REALIZING that switching a breathing mix underwater may have some effect on his diving, even though in the hypothetical given no real issue exists. He's on...

Thanks :D I don't think anyone will disagree with you. Bruce Wienke writes that we presently lack the technology and computing power to accurately model the body's responses to compression and decompression. The best any modeler can do is observe the data, choose a statistically acceptable...

If the inquiry is physiological only, then the primary risks are CNS and pulmonary O2 toxicity. Those are a function of partial pressure and exposure time. Consider also that high oxygen tensions cause coronary vasoconstriction, but I have no idea of the extent to which (or even IF) such would...

I think the others have hit the high points pretty well. Consider a few other reasons: 1. PADI, at least, limits training dives to three per day, so even if an instructor maxes out his/her training dives for a single OW class per day, s/he isn't going to push air NDLs in the least bit. Even...

I know that Alan Rolfness over at Salem Scuba frequently dives Hood Canal. He's done everything from OW classes to deep trimix dives in Hood Canal, and knows the area well. Shop number is 503-588-DIVE. If he can't get you the information you're after, he'll know who you can call.