NAUI Nitrox Diver 68 Questions and Correct
Answers 2025
the ______ in the air you are breathing limits the time you can stay at depth -
✔️nitrogen
in the early twentieth century, a quantitative model for nitrogen loading and dive tables were
developed by -
✔️John Scott Haldane
we say that nitrogen is an inert gas. this means -
✔️our bodies do not use the nitrogen we breathe
credit for developing and introducing nitrox diving techniques for standard scuba goes to -
✔️Dr. Morgan Wells
NAUI sanctioned enriched air nitrox training in -
✔️1992
two benefits of diving with nitrox are -
✔️longer dive times and shorter surface intervals
what does the "x" stand for in the term EANx? -
✔️the percentage of oxygen in the mix
in 1878, Paul Bert established that_____, liberated as bubbles following sudden decompression was
the cause of decompression sickeness -
✔️nitrogen
nitrox is a _____ breathing gas -
, ✔️mid-range
nitrox provides the greatest advantages for dives in the _____ depth range -
✔️15-33 m (50-110 ft)
as a gas is heated in a rigid closed container its pressure will -
✔️increase
"if one quantity of gas will dissolve at one atmosphere of pressure, then three quantities of gas will
dissolve at three atmospheres." this statement refers to which law? -
✔️Henry's Law
atmospheric pressure can be measured in many ways. what is one atmosphere in millimeters of
mercury? -
✔️760 mmHg
the ____ of a specific gas in a mix is the portion of the total pressure exerted by that gas -
✔️partial pressure
what is the absolute pressure at 17 msw (56 fsw)? -
✔️2.7 ata
what is the oxygen partial pressure in EAN35 at a depth of 26 msw (85 fsw)? -
✔️1.3 ata
if the oxygen partial pressure in your mix is 1.3 ata at a depth of 37 msw (122 fsw), what is the
fraction of oxygen in the mix? -
✔️0.28
what is the partial pressure of oxygen in air at a depth of 21 msw (69 fsw)? -
✔️0.65 ata
Answers 2025
the ______ in the air you are breathing limits the time you can stay at depth -
✔️nitrogen
in the early twentieth century, a quantitative model for nitrogen loading and dive tables were
developed by -
✔️John Scott Haldane
we say that nitrogen is an inert gas. this means -
✔️our bodies do not use the nitrogen we breathe
credit for developing and introducing nitrox diving techniques for standard scuba goes to -
✔️Dr. Morgan Wells
NAUI sanctioned enriched air nitrox training in -
✔️1992
two benefits of diving with nitrox are -
✔️longer dive times and shorter surface intervals
what does the "x" stand for in the term EANx? -
✔️the percentage of oxygen in the mix
in 1878, Paul Bert established that_____, liberated as bubbles following sudden decompression was
the cause of decompression sickeness -
✔️nitrogen
nitrox is a _____ breathing gas -
, ✔️mid-range
nitrox provides the greatest advantages for dives in the _____ depth range -
✔️15-33 m (50-110 ft)
as a gas is heated in a rigid closed container its pressure will -
✔️increase
"if one quantity of gas will dissolve at one atmosphere of pressure, then three quantities of gas will
dissolve at three atmospheres." this statement refers to which law? -
✔️Henry's Law
atmospheric pressure can be measured in many ways. what is one atmosphere in millimeters of
mercury? -
✔️760 mmHg
the ____ of a specific gas in a mix is the portion of the total pressure exerted by that gas -
✔️partial pressure
what is the absolute pressure at 17 msw (56 fsw)? -
✔️2.7 ata
what is the oxygen partial pressure in EAN35 at a depth of 26 msw (85 fsw)? -
✔️1.3 ata
if the oxygen partial pressure in your mix is 1.3 ata at a depth of 37 msw (122 fsw), what is the
fraction of oxygen in the mix? -
✔️0.28
what is the partial pressure of oxygen in air at a depth of 21 msw (69 fsw)? -
✔️0.65 ata
