Rob Meddes
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The things you learn
Nitrox vs Air
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The things you learn
"Having breathed 100% O2 on many occasion for lengths of time up to 60mins. i have never noticed any level of narcosis."
If you were breathing 100% O2 at depths where you would be aware of narcosis, you'd have serious problems with oxygen toxicity, the likely hood of surfacing alive would be nil.
"Also i think that any narcotic gas would not be supplied to pilots of fighters at 100% if there was the slightest narcotic effect."
There is no narcosis at that PO2, there is no difference between breathing oxygen and breathing air with regard to narcotic effect.
"Surely if the toxicity of O2 is directly in proportion to that of N2 (replace this with this & still be equally narked) then there would be some literature & some menton of it in any of the various agencies Nitrox courses."
Not "toxicity of O2", but rather narcotic effect. It is mentioned in the texts. See NAUI NITROX: A Guide to Diving With Oxygen Enriched Air page 1-4; YMCA Enriched Air Nitrox Diving page 1-4; and NOAA Diving Manual page 15-3.
If you were breathing 100% O2 at depths where you would be aware of narcosis, you'd have serious problems with oxygen toxicity, the likely hood of surfacing alive would be nil.
"Also i think that any narcotic gas would not be supplied to pilots of fighters at 100% if there was the slightest narcotic effect."
There is no narcosis at that PO2, there is no difference between breathing oxygen and breathing air with regard to narcotic effect.
"Surely if the toxicity of O2 is directly in proportion to that of N2 (replace this with this & still be equally narked) then there would be some literature & some menton of it in any of the various agencies Nitrox courses."
Not "toxicity of O2", but rather narcotic effect. It is mentioned in the texts. See NAUI NITROX: A Guide to Diving With Oxygen Enriched Air page 1-4; YMCA Enriched Air Nitrox Diving page 1-4; and NOAA Diving Manual page 15-3.
Rob Meddes once bubbled...
. Also i think that any narcotic gas would not be supplied to pilots of fighters at 100% if there was the slightest narcotic effect.
Surely if the toxicity of O2 is directly in proportion to that of N2 (replace this with this & still be equally narked) then there would be some literature & some menton of it in any of the various agencies Nitrox courses.
Your first point is off base. There is a reduction of pressure in a pressurized cabin.
Second, Toxicity has absolutely nothing to do with nitrogen. If you are spending 60 minutes on 100%, you may want to seek additional training as your understanding of O2 is very limited.
Cheers
Walter beat me to the punch, sorry for the double post
Rob Meddes
Guest
Sorry i should've mentioned the the 100% O2 i was breathing was in a fighter jet not in water
The O2 TOXICITY was a mistake, it should've said narcosis.
I have looked into this & your all right & i'm all wrong so i'll delete what i said to prevent misleading people.
Thank you for your advice. Every other bit of information bore out the theoretical results as described above although as there's no way to measure narcosis it's still all theoretical. (or so i was informed)
Cheers & good diving
Rob
Stone
Contributor
When I got my Nitrox cert (for $150), it included the PADI materials (book, EAN32 and 36 tables, and EAD table). It also included a two tank dive which would have cost about $70. For me, it was a good deal.
If you dive between 60 and 130 fsw, it is probably worth it.
You may have seen reference to my graphs on other Nitrox threads, but if not, go to my website below and use the "Dive Documents" link to find the HTML and Excel versions of "Air vs. Nitrox". The Excel version is interactive, and if you can estimate your SAC, the graphs can give you an idea of what your increased bottom time might be for a given depth.
Nitrox is of great benefit not only for multi-day diving, but it can shorten SI for repetitive dives on a single day.
The evidence may be anecdotal, but I feel much better diving Nitrox vs. Air.
If you dive between 60 and 130 fsw, it is probably worth it.
You may have seen reference to my graphs on other Nitrox threads, but if not, go to my website below and use the "Dive Documents" link to find the HTML and Excel versions of "Air vs. Nitrox". The Excel version is interactive, and if you can estimate your SAC, the graphs can give you an idea of what your increased bottom time might be for a given depth.
Nitrox is of great benefit not only for multi-day diving, but it can shorten SI for repetitive dives on a single day.
The evidence may be anecdotal, but I feel much better diving Nitrox vs. Air.
Spectre
Contributor
Keep in mind the _reason_ you're breathing O2 in the fighter jet... In diving, you have to worry about the PpO2 of your breathing gas due to Oxtox, because the increase of pressure causing the PpO2 to be multiplied.
When you decrease the pressure, the decrease in PpO2 quickly makes air hypoxic [I believe .14 ATM of O2 is hypoxic?]. So if you're breathing 100% O2 at decreased atmospheric pressures, then you're not breathing 1 ATM of O2 anymore...
Boyle's law works both ways. If your 1 atmosphere above surface level, then 100% O2 is going to be giving you a PpO2 of .5 ATM.
Um...
1 ATM above surface level? in space?
I'm guessing you meant .5 ATM above surface level.
At 18,000 ft the absolute pressure is .5 ATM.
dascubadweeb
Guest
O.K. guys, I'm studying for my NITROX certification as we speak. Hell, I'm hoping I can remember how figure dive tables again. I've become dependant on my computer. Y'all are spouting out stats and information that is intimidating! Golly, Gee - hope this little Texan has 'nuf skoolin' to pass the course!
Wish me luck...
Wish me luck...
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