NITROX QUESTIONS WITH
COMPLETE SOLUTIONS
The nitrogen in the air you are breathing limits what? - Correct Answers -The nitrogen in
the air limits the depth to which you can dive, the same time you can stay at depth, and
the number of dives you can make in a day.
What are the several names given to the gas mixture that is higher in oxygen and lower
in nitrogen? - Correct Answers -Oxygen-Enriched Air,
Enriched Air Nitrox,
Nitrox
When diving, what causes the additional nitrogen to be dissolved in our tissues? -
Correct Answers -When diving, the increased pressure of depth causes additional
nitrogen to be dissolved in our tissues.
In 1878, Paul Bert established that nitrogen, liberated as bubbles following sudden
decompression, was the cause of what? - Correct Answers -Decompression sickness
Credit for developing and introducing nitrox diving techniques for standard scuba goes
to whom? - Correct Answers -Dr. Morgan Wells
In what year did NAUI officially endorse nitrox training by NAUI instructors? - Correct
Answers -1992
List 4 advantages of using nitrox - Correct Answers -Extend bottom time
Shorten required surface interval
Safety margin
Less physically tired (fatigue)
Nitrox provides the greatest advantages for dives in what depth range? - Correct
Answers -15-33 meter (50-100 foot) depth range
The "x" in EANx is often replaced with what? - Correct Answers -Oxygen percentage
What compares the quantity of the component gas to a total of 100? What compares it
to 1? - Correct Answers -Percentage.
Fraction.
, Each of the individual components in a gas mixture will exert its chemical or physical
effects independently, according to what? - Correct Answers -Its proportion in the
mixture
Oxygen is what percentage of atmospheric air?
Nitrogen? - Correct Answers -21%;
79%
The symptoms of nitrogen narcosis parallel those often seen in what? - Correct
Answers -Alcohol intoxication
If we heat a gas, we are adding _________, increasing the speed of the molecules and
the force of the impacts - Correct Answers -Energy
Which law states: "At a constant temperature, the volume of a gas varies inversely with
absolute pressure, while the density of a gas varies inversely with absolute pressure?" -
Correct Answers -Boyle's Law
Which law states: "The amount of any given gas that will dissolve in a liquid at a given
temperature is a function of the partial pressure of the gas that is in contact with the
liquid and the solubility coefficient of the gas in the particular liquid?" - Correct Answers
-Henry's Law
What is the portion of the total gas pressure exerted by a single gas in a mixture of
gases? - Correct Answers -Partial Pressure
Which law states: "The total pressure exerted by a mixture of gases is equal to the sum
of the pressures that would be exerted by each of the gases if it alone were present and
occupied volume."? - Correct Answers -Dalton's Law
Each __________ that you descend in the ocean adds another atmosphere of pressure
to the one atmosphere of surface pressure. - Correct Answers -10 meters (33 feet)
When you are at a depth of 20 meters of seawater (msw)/66 feet of seawater (fsw), the
absolute pressure is what? - Correct Answers -3 ata
To convert depth to absolute pressure, you first find the water (hydrostatic) pressure in
atmospheres and then add what? - Correct Answers -One atmosphere for the sea level
air pressure
To determine the partial pressure of a gas in a mixture, you multiply what two numbers?
- Correct Answers -Gas fraction
Absolute pressure
Using the Oxygen Partial Pressure at Depth table, what is PO2 of EAN34 at a depth of
24 msw (80fsw)? - Correct Answers -1.16 ata
COMPLETE SOLUTIONS
The nitrogen in the air you are breathing limits what? - Correct Answers -The nitrogen in
the air limits the depth to which you can dive, the same time you can stay at depth, and
the number of dives you can make in a day.
What are the several names given to the gas mixture that is higher in oxygen and lower
in nitrogen? - Correct Answers -Oxygen-Enriched Air,
Enriched Air Nitrox,
Nitrox
When diving, what causes the additional nitrogen to be dissolved in our tissues? -
Correct Answers -When diving, the increased pressure of depth causes additional
nitrogen to be dissolved in our tissues.
In 1878, Paul Bert established that nitrogen, liberated as bubbles following sudden
decompression, was the cause of what? - Correct Answers -Decompression sickness
Credit for developing and introducing nitrox diving techniques for standard scuba goes
to whom? - Correct Answers -Dr. Morgan Wells
In what year did NAUI officially endorse nitrox training by NAUI instructors? - Correct
Answers -1992
List 4 advantages of using nitrox - Correct Answers -Extend bottom time
Shorten required surface interval
Safety margin
Less physically tired (fatigue)
Nitrox provides the greatest advantages for dives in what depth range? - Correct
Answers -15-33 meter (50-100 foot) depth range
The "x" in EANx is often replaced with what? - Correct Answers -Oxygen percentage
What compares the quantity of the component gas to a total of 100? What compares it
to 1? - Correct Answers -Percentage.
Fraction.
, Each of the individual components in a gas mixture will exert its chemical or physical
effects independently, according to what? - Correct Answers -Its proportion in the
mixture
Oxygen is what percentage of atmospheric air?
Nitrogen? - Correct Answers -21%;
79%
The symptoms of nitrogen narcosis parallel those often seen in what? - Correct
Answers -Alcohol intoxication
If we heat a gas, we are adding _________, increasing the speed of the molecules and
the force of the impacts - Correct Answers -Energy
Which law states: "At a constant temperature, the volume of a gas varies inversely with
absolute pressure, while the density of a gas varies inversely with absolute pressure?" -
Correct Answers -Boyle's Law
Which law states: "The amount of any given gas that will dissolve in a liquid at a given
temperature is a function of the partial pressure of the gas that is in contact with the
liquid and the solubility coefficient of the gas in the particular liquid?" - Correct Answers
-Henry's Law
What is the portion of the total gas pressure exerted by a single gas in a mixture of
gases? - Correct Answers -Partial Pressure
Which law states: "The total pressure exerted by a mixture of gases is equal to the sum
of the pressures that would be exerted by each of the gases if it alone were present and
occupied volume."? - Correct Answers -Dalton's Law
Each __________ that you descend in the ocean adds another atmosphere of pressure
to the one atmosphere of surface pressure. - Correct Answers -10 meters (33 feet)
When you are at a depth of 20 meters of seawater (msw)/66 feet of seawater (fsw), the
absolute pressure is what? - Correct Answers -3 ata
To convert depth to absolute pressure, you first find the water (hydrostatic) pressure in
atmospheres and then add what? - Correct Answers -One atmosphere for the sea level
air pressure
To determine the partial pressure of a gas in a mixture, you multiply what two numbers?
- Correct Answers -Gas fraction
Absolute pressure
Using the Oxygen Partial Pressure at Depth table, what is PO2 of EAN34 at a depth of
24 msw (80fsw)? - Correct Answers -1.16 ata
