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Multi leveldive
Asingleorrepetitivedivethatincludestimespentatvariousdepthsandwhose
no decompressionlimits aretherefore not determinedsolely bythe maximum
depth attained.
Nitrox
Insportsdiving,referstoanymixwith ahigherfractionofoxygenthanstandard
air.
NOAA
United StatesNational Oceanic and AtmosphericAdministration.
No decompressiontime
Themaximum amountof timea divermay remainat aparticular depthwithout
having tomake decompression stops duringthe subsequent ascent.
No decompressiondive
Any dive which permits a direct, uninterrupted ascent to the surface at any
time.
NO DECTIME
Abbreviation forno decompression time limit.
OEA =EAN = EANx
Abbreviations foroxygen enriched air nitrox.
OLF
Abbreviation foroxygen limit fraction.
OTU
Abbreviation foroxygen tolerance unit.
Oxygen toleranceunit
Used tomeasure the whole-body-toxicity.
Oxygen limitfraction
AtermusedbySuuntoforthevaluesdisplayedintheoxygentoxicitybargraph.
The valueis either the CNS%or the OTU%.
O
2
%
Oxygen percentage or oxygenfraction in the breathing gas.Standard air has
21% oxygen.
Oxygen partialpressure
Limitsthe maximumdepthto whichthenitrox mixturecanbe safelyused. The
maximumpartialpressurelimitforenrichedairdivingis1.4bar.Thecontingency
partial pressurelimit is 1.6 bar.Dives beyond this limitrisk immediate oxygen
toxicity.
PO
2
Abbreviation foroxygen partial pressure.
RGBM
Abbreviation forReduced Gradient BubbleModel.
Reduced GradientBubble Model
Modern algorithmfor tracking both dissolvedand free gasin divers.
Repetitive dive
Any dive whose decompression time limits are affected by residual nitrogen
absorbed duringprevious dives.
Residual nitrogen
The amountof excess nitrogen remainingin a diverafter one ormore dives.
SURF TIME
Abbreviation forsurface interval time.
Surface intervaltime
Elapsed time between surfacing from a dive and beginning a descent for the
subsequent repetitivedive.
Tissuegroup
Theoretical concept used to model bodily tissues for the construction of
decompression tablesor calculations.
Whole-body toxicity
Another form of oxygen toxicity, which is caused by prolonged exposure to
high oxygen partial pressures. The most common symptoms are irritation in
thelungs, aburning sensationinthe chest,coughing andreductionof thevital
capacity. Alsocalled Pulmonary OxygenToxicity.See also OTU.
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