NAUI INSTRUCTOR WITH COMPLETE
SOLUTIONS 2025.
Henry's Law - ANSWER: The amount of gas dissolved in a liquid is directly related to its partial
pressure above the liquid.
Relationship of gas solubility and temperature - ANSWER: Solubility of gas decreases with
increasing temperature
(INVERSELY RELATED)
Inert gas loading in relation to body tissue - ANSWER: Body tissue absorbs more inert gas as
depth increases
Benefit of Dive Computer compared to Dive Tables - ANSWER: Gives the diver credit for
shallow portions of the dive
Cold or Strenuous dive planning rule - ANSWER: Use the next greater dive TIME to determine
letter group
Equilibrium as it relates to nitrogen in the body - ANSWER: When the pressure of nitrogen is
balanced between air and your body
Haldane surfacing ratio - ANSWER: Originally 2:1 - Updated with new research to 1.58:1
Tissue compartment half-time - ANSWER: The time required for the compartment to absorb or
eliminate half of the pressure difference between what it started with and the ambient pressure
M-Value of tissue - ANSWER: The maximum allowable nitrogen (inert gas) pressure in a specific
tissue
NAUI recommendation for diving while pregnant - ANSWER: Do not dive while pregnant
Haldane tissue compartments - ANSWER: Haldane - 5 compartments
Modern Computers - Apx. 16 compartments
Tissue compartment - ANSWER: Mathematical model consisting of multiple theoretical tissues
, and their relative halftimes
Fast compartments - short halftimes
Slow compartments - long halftimes
Ascent rate at altitude - ANSWER: Slower than at sea level
Extend dive times with gas by - ANSWER: Decreased nitrogen and increased oxygen in
breathing gas
RNT - ANSWER: Residual Nitrogen Time
Tme already spent at the repetitive dive depth (dive tables)
Procedure for missed decompression stops - ANSWER: Remain out of the water, rest, breathe
100% oxygen, drink fluids, be monitored for signs of decompression illness, transported to a
hyperbaric facility if symptoms arise
SIT - ANSWER: Surface Interval Time
Longer time at the surface allows for increased repeat dive times
Canadian Dive Tables published by the Defense and Civil Institute of Environmental Medicine
(DCIEM) - ANSWER: Based on 20+ years of research pioneered by Kidd and Stubbs (1962)
Swiss Dive Tables - ANSWER: Developed by A.A. Bühlmann at the University of Zurich -
EXTENDED TO INCLUDE ALTITUDE DIVING
If the time spent making a "precautionary stop" at 5 msw (15 fsw) causes your Total Dive Time
to exceed the Dive Time Limits, you should: - ANSWER: Use the Maximum Dive Time as your
Total Dive Time
Aching pains an hour after a dive might be: - ANSWER: Decompression sickness
ATA rating for most hyperbaric chambers for treating divers: - ANSWER: 6 ATA
Haldane Tissue Half-Times (Compartments) - ANSWER: 5, 10, 20, 40, 75 Mins
High altitude dive - ANSWER: Any dive at greater than 1000 feet
Ideal hyperbaric chamber for dive injury - ANSWER: Multiplace, double-lock chamber rated for
service to six atmospheres
Repetitive Dive - ANSWER: Any dive started within 24 hours after a previous dive
NAUI recommended minimum SIT time - ANSWER: 60 mins
Dives shallower than 40 ft are considered how deep on NAUI Dive Tables - ANSWER: 40 ft
SOLUTIONS 2025.
Henry's Law - ANSWER: The amount of gas dissolved in a liquid is directly related to its partial
pressure above the liquid.
Relationship of gas solubility and temperature - ANSWER: Solubility of gas decreases with
increasing temperature
(INVERSELY RELATED)
Inert gas loading in relation to body tissue - ANSWER: Body tissue absorbs more inert gas as
depth increases
Benefit of Dive Computer compared to Dive Tables - ANSWER: Gives the diver credit for
shallow portions of the dive
Cold or Strenuous dive planning rule - ANSWER: Use the next greater dive TIME to determine
letter group
Equilibrium as it relates to nitrogen in the body - ANSWER: When the pressure of nitrogen is
balanced between air and your body
Haldane surfacing ratio - ANSWER: Originally 2:1 - Updated with new research to 1.58:1
Tissue compartment half-time - ANSWER: The time required for the compartment to absorb or
eliminate half of the pressure difference between what it started with and the ambient pressure
M-Value of tissue - ANSWER: The maximum allowable nitrogen (inert gas) pressure in a specific
tissue
NAUI recommendation for diving while pregnant - ANSWER: Do not dive while pregnant
Haldane tissue compartments - ANSWER: Haldane - 5 compartments
Modern Computers - Apx. 16 compartments
Tissue compartment - ANSWER: Mathematical model consisting of multiple theoretical tissues
, and their relative halftimes
Fast compartments - short halftimes
Slow compartments - long halftimes
Ascent rate at altitude - ANSWER: Slower than at sea level
Extend dive times with gas by - ANSWER: Decreased nitrogen and increased oxygen in
breathing gas
RNT - ANSWER: Residual Nitrogen Time
Tme already spent at the repetitive dive depth (dive tables)
Procedure for missed decompression stops - ANSWER: Remain out of the water, rest, breathe
100% oxygen, drink fluids, be monitored for signs of decompression illness, transported to a
hyperbaric facility if symptoms arise
SIT - ANSWER: Surface Interval Time
Longer time at the surface allows for increased repeat dive times
Canadian Dive Tables published by the Defense and Civil Institute of Environmental Medicine
(DCIEM) - ANSWER: Based on 20+ years of research pioneered by Kidd and Stubbs (1962)
Swiss Dive Tables - ANSWER: Developed by A.A. Bühlmann at the University of Zurich -
EXTENDED TO INCLUDE ALTITUDE DIVING
If the time spent making a "precautionary stop" at 5 msw (15 fsw) causes your Total Dive Time
to exceed the Dive Time Limits, you should: - ANSWER: Use the Maximum Dive Time as your
Total Dive Time
Aching pains an hour after a dive might be: - ANSWER: Decompression sickness
ATA rating for most hyperbaric chambers for treating divers: - ANSWER: 6 ATA
Haldane Tissue Half-Times (Compartments) - ANSWER: 5, 10, 20, 40, 75 Mins
High altitude dive - ANSWER: Any dive at greater than 1000 feet
Ideal hyperbaric chamber for dive injury - ANSWER: Multiplace, double-lock chamber rated for
service to six atmospheres
Repetitive Dive - ANSWER: Any dive started within 24 hours after a previous dive
NAUI recommended minimum SIT time - ANSWER: 60 mins
Dives shallower than 40 ft are considered how deep on NAUI Dive Tables - ANSWER: 40 ft
