In 1878, Paul Bert established that _____, liberated as bubbles following sudden decompression was the cause of decompression sickness. - ANSWER Nitrogen
Nitrox is a _____ breathing gas. - ANSWER Mid-Range
Nitrox provides the greatest advantages for dives in the _____ depth range. - ANSWER 15...
NAUI Nitrox Diver 100%
Correct
In 1878, Paul Bert established that _____, liberated as bubbles following sudden decompression was the
cause of decompression sickness. - ANSWER Nitrogen
Nitrox is a _____ breathing gas. - ANSWER Mid-Range
Nitrox provides the greatest advantages for dives in the _____ depth range. - ANSWER 15-33m (50-110ft)
As a gas is heated in a rigid closed container its pressure will: - ANSWER 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? - ANSWER Henry's Law
Atmospheric pressure can be measured in many ways. What is one atmosphere in millimeters of
mercury? - ANSWER 760mmHg
The _____________ of a specific gas in a mix is the portion of the total pressure exerted by that gas. -
ANSWER Partial Pressure
What is the absolute pressure at 17 msw (56 fsw)? - ANSWER 2.7 ata
What is the oxygen partial pressure (PO2) in EAN35 at a depth of 26 msw (85 fsw)? - ANSWER 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? - ANSWER .28
, What is the partial pressure of oxygen in air at a depth of 21 msw (69 fsw)? - ANSWER .65 ata
The symptoms of nitrogen narcosis parallel those often seen in _____. - ANSWER Alcohol Intoxication
_____ Law states: "At a constant temperature, the volume of a gas varies inversely with absolute
pressure, while the density of a gas varies directly with absolute pressure." - ANSWER Boyle's Law
The two most commonly used nitrox mixtures, also known as NOAA Nitrox I and NOAA Nitrox II, are: -
ANSWER 32% and 36% oxygen.
The Maximum Operating Depth (MOD) of a gas mix is determined by: - ANSWER The maximum
acceptable partial pressure of oxygen.
Calculate the normal maximum operating depth for EAN32 (PO2=1.4 ata). - ANSWER 34 msw (111 fsw)
What is the "best mix" (not to exceed 40% O2) to use for an oxygen partial pressure limit of 1.6 ata on a
dive to 27 msw (90 fsw)? - ANSWER EAN40
The maximum depth dived with a given nitrox mixture is known as _____. - ANSWER Maximum
operating depth
Oxygen percentages on the NAUI APP can be set from _____. - ANSWER 21%-40%
_____ is the highest percentage of oxygen that can be used at a partial pressure of 1.4 at the planned
dive depth. - ANSWER Best mix
A diver using EAN32 makes a dive to 33 msw (110 fsw) for 23 minutes. After a surface interval of 2 hours,
they make a second dive (also using EAN32) to 23 msw (75 fsw). Using NAUI EAN32 Dive Tables, what is
the adjusted maximum dive time for the second dive? - ANSWER 11 Minutes
If the same diver in question 1 were using NAUI RGBM EAN32 Dive Tables, what would be his maximum
dive time for the second dive? - ANSWER 47 minutes
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