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NAUI Instructor School Questions and Correct Answers the Latest Update
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NAUI Instructor School Questions
and Correct Answers the Latest
Update
Henry's Law
✓ The amount of gas dissolved in a liquid is directly related to its partial pressure
above the liquid.
Relationship of gas solubility and temperature
✓ Solubility of gas decreases with increasing temperature
✓ (INVERSELY RELATED)
Inert gas loading in relation to body tissue
✓ Body tissue absorbs more inert gas as depth increases
Benefit of Dive Computer compared to Dive Tables
✓ Gives the diver credit for shallow portions of the dive
Cold or Strenuous dive planning rule
✓ Use the next greater dive TIME to determine letter group
Equilibrium as it relates to nitrogen in the body
✓ When the pressure of nitrogen is balanced between air and your body
Haldane surfacing ratio
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✓ Originally 2:1 - Updated with new research to 1.58:1
Tissue compartment half-time
✓ 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
✓ The maximum allowable nitrogen (inert gas) pressure in a specific tissue
NAUI recommendation for diving while pregnant
✓ Do not dive while pregnant
Haldane tissue compartments
✓ Haldane - 5 compartments
✓ Modern Computers - Apx. 16 compartments
Tissue compartment
✓ Mathematical model consisting of multiple theoretical tissues and their relative
halftimes
✓ Fast compartments - short halftimes
✓ Slow compartments - long halftimes
Ascent rate at altitude
✓ Slower than at sea level
Extend dive times with gas by
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✓ Decreased nitrogen and increased oxygen in breathing gas
RNT
✓ Residual Nitrogen Time
✓ Tme already spent at the repetitive dive depth (dive tables)
Procedure for missed decompression stops
✓ 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
✓ 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)
✓ Based on 20+ years of research pioneered by Kidd and Stubbs (1962)
Swiss Dive Tables
✓ 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:
✓ Use the Maximum Dive Time as your Total Dive Time
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