[Conor]

I'm not even Nitrox qualified, but I am interested in the gas laws being applied.

So would the following be right according to the tables ?

32% Oxygen => 68% Nitrogen, Pressure at 30M 4 ATM

ppN2 = 0.68x4 = 2.72

Surface Air 21% O2 => 79% N2

equivalent pressure on air => 2.72/0.79 = 3.44 ATM

So that means in terms of narcotic effects of Nitrogen at 30M of a 32% mix is equivalent to diving to 24.4 M (approx) on air.

So if a diver normally gets narked around 25 M the same diver could get narked at 30 on this mix, especially if he has some of the other risk factors (tiredness, cold, dehydration, stress etc).

Does this make any sense ?

Cheers

Conor