<font color='#810541'>Excuse me if I am being a numpty .... I've always been of the understanding that the ratios (e.g. 16/24/60) are expressed in the order O2/H2/N2?
Is that correct?
If so ... plunging on ... the mix specified above is NOT normoxic as (AFAIUI) normoxic means "with a normal level of oxygen", i.e. 21%:
Quote:
| Originally Posted by [b Quote[/b] ]Trimix is comprised of three (tri) gases; nitrogen, oxygen and either helium, neon or hydrogen. The third gas is nearly always helium as neon is expensive and hydrogen somewhat unstable. "Normoxic Trimix" is a breathing mix with no less then 21% oxygen and no more then 25-30% helium |
(I found this definition on
divermag article)
So, if Heliair is Helium mixed with air, it can't be normoxic?
(again, apologies if I am being a numpty, I am not Trimix or any kind of gas blending trained but I am an avid reader, and I read up on Heliair after it was mentioned in either The Last Dive or Deep Descent)
Andy