NITROX EXPECTED QUESTIONS WITH VERIFIED
ANSWERS (2026)
●● What are the several names given to the gas mixture that is higher in
oxygen and lower in nitrogen?
Answer: Oxygen-Enriched Air,
Enriched Air Nitrox,
Nitrox
●● When diving, what causes the additional nitrogen to be dissolved in
our tissues?
Answer: 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?
Answer: Decompression sickness
●● Credit for developing and introducing nitrox diving techniques for
standard scuba goes to whom?
Answer: Dr. Morgan Wells
,●● In what year did NAUI officially endorse nitrox training by NAUI
instructors?
Answer: 1992
●● List 4 advantages of using nitrox
Answer: Extend bottom time
Shorten required surface interval
Safety margin
Less physically tired (fatigue)
●● Nitrox provides the greatest advantages for dives in what depth
range?
Answer: 15-33 meter (50-100 foot) depth range
●● The "x" in EANx is often replaced with what?
Answer: Oxygen percentage
●● What compares the quantity of the component gas to a total of 100?
What compares it to 1?
Answer: Percentage.
Fraction.
, ●● Each of the individual components in a gas mixture will exert its
chemical or physical effects independently, according to what?
Answer: Its proportion in the mixture
●● Oxygen is what percentage of atmospheric air?
Nitrogen?
Answer: 21%;
79%
●● The symptoms of nitrogen narcosis parallel those often seen in what?
Answer: Alcohol intoxication
●● If we heat a gas, we are adding _________, increasing the speed of
the molecules and the force of the impacts
Answer: 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?"
Answer: 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
ANSWERS (2026)
●● What are the several names given to the gas mixture that is higher in
oxygen and lower in nitrogen?
Answer: Oxygen-Enriched Air,
Enriched Air Nitrox,
Nitrox
●● When diving, what causes the additional nitrogen to be dissolved in
our tissues?
Answer: 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?
Answer: Decompression sickness
●● Credit for developing and introducing nitrox diving techniques for
standard scuba goes to whom?
Answer: Dr. Morgan Wells
,●● In what year did NAUI officially endorse nitrox training by NAUI
instructors?
Answer: 1992
●● List 4 advantages of using nitrox
Answer: Extend bottom time
Shorten required surface interval
Safety margin
Less physically tired (fatigue)
●● Nitrox provides the greatest advantages for dives in what depth
range?
Answer: 15-33 meter (50-100 foot) depth range
●● The "x" in EANx is often replaced with what?
Answer: Oxygen percentage
●● What compares the quantity of the component gas to a total of 100?
What compares it to 1?
Answer: Percentage.
Fraction.
, ●● Each of the individual components in a gas mixture will exert its
chemical or physical effects independently, according to what?
Answer: Its proportion in the mixture
●● Oxygen is what percentage of atmospheric air?
Nitrogen?
Answer: 21%;
79%
●● The symptoms of nitrogen narcosis parallel those often seen in what?
Answer: Alcohol intoxication
●● If we heat a gas, we are adding _________, increasing the speed of
the molecules and the force of the impacts
Answer: 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?"
Answer: 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
