Tech diving

[paolov]

invite him to Brgy. Pasaway

.

 

[Xizang]

so heliox for instance is a moronix... er normoxic mix?

Jag

yup if it has +/- 21% oxygen it is normoxic. But heliox can be hypoxic also (less than 16% oxygen to be exact), in fact it is a common blend used in creating hypoxic mixes for use as a bottom gas. Its quite an expensive mix compared to trimix

 

[grazie42]

Originally Posted by Halthron
No, Jai had it right. Normoxic is 21%, hyperoxic is greater than 21%.

Hypoxic is less than 21%...
the following link should be all the proof you need:
http://www.medfriendly.com/hypoxic.html

I agree that HYPERoxic gasses have more than 21%...(I actually posted hypoxic...)....
guess one or two letters make a big difference sometimes huh?

 

[paolov]

i hope this discussion leads to clarification of definition of terms and doesn't go to personal antagonism.....

 

[Halthron]

No, Jai had it right. Normoxic is 21%, hyperoxic is greater than 21%.

Hypoxic is less than 21%...
the following link should be all the proof you need:
http://www.medfriendly.com/hypoxic.html

You referenced a link to support that part I agreed with you on?

I agree that HYPERoxic gasses have more than 21%...(I actually posted hypoxic...)....
guess one or two letters make a big difference sometimes huh?

A letter off here or there, it's close enough for government work.

 

[Babydamulag]

While you are on the subject and for general consumption:
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In open-circuit scuba, two types of trimix are commonly used: "normoxic" trimix is used in the 30 metre / 100 feet to 60 metre / 200 feet depth range and "hypoxic" trimix is used for deeper diving, as a "bottom" gas only. Also, in rebreathers that use trimix diluents, the mix will be "hyperoxic" in shallow water.
-------------
Talk to Ethei Robrigado at LBC (Puerto Galera). He is one of the best technical instructors on the planet. He was on John's World Record Dive Team.

 

[paolov]

nice nice... see guys.... on the subject of these matters, we/you may know stuffs that you have learned. however that knowledge is not absolute, hence it is better if we come to these discussions in a manner of exchanges and respecting the others point of view. if the other person is wrong in your opinion then let him be , it's his choice, it's his life.

However the best is to seek those who have put more study and understanding to the topic , most likely these knowledgeable people would be more than gladly share their understanding .

history will show, those who claim absolute knowledge are those who need to learn more.

 

[Twomixdiver]

The term "Normoxic" first came into the technical diving lingo as defined IANTD's "Normoxic Trimix Diving" standard:

"Trimix dives must be conducted using a mixture containing at least 20% oxygen (± 1%), and no more than 30% helium (± 1%).

Please read this long list at: http://www.essi.fr/~pfz/PLONGEE/CD-CoursetManuels/IANTDcursus.html.


The medical definitions are different from the diving definitions. In diving what is hypoxic, hyperoxic or normoxic depends on the Partial Pressures of oxygen, or more simply, what percentage of oxygen you are using at a particular depth.

When we live on the surface, we breath air which has 20.9% O2. Go down to 100 meters (330 ft) and this oxygen level becomes "hyperoxic" or toxic. To reduce your risk and survive at this depth you need to reduce the O2 component to as low as 12%.

If, however, you breath 12% O2 at the surface, this gas goes "hypoxic"; and you'd either get dizzy or pass out, and maybe probably die.

So as far as IANTD diving goes, "normoxic" means you are using a diving gas which has an O2 content of between 20 and 30 percent. I am not aware of any other agency that uses the term "normoxic".

 

[jonix]

i'm starting to enjoy this moxic-toxic thing

 

[Hammerhead]

Normoxic = norm (from normal) + ox (from oxygen) + ic (to make it adjectival)

basically normal oxygen i.e. 21% as in air.

hyper means more (i.e. more than 'normal' >21%)

hypo means less (i.e. less than 'normal' <21%)

I think.