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Nitrox
In sports diving, refers to any mix with a higher fraction of oxygen than
standard air.
NOAA
United States National Oceanic and Atmospheric Administration.
No decompression time
The maximum amount of time a diver may remain at a particular depth
without having to make decompression stopsduring the subsequent as-
cent.
No decompression dive
Any dive which permits a direct, uninterrupted ascent to the surface at
any time.
NO DEC TIME
Abbreviation for no decompression time limit.
OEA = EAN = EANx
Abbreviations for oxygen enriched air nitrox.
OLF
Abbreviation for oxygen limit fraction.
OTU
Abbreviation for oxygen tolerance unit.
Oxygen tolerance unit
Used to measure the whole-body-toxicity.
Oxygen limit fraction
A termused by Suuntofor thevalues displayed inthe oxygen toxicitybar
graph. The value is either the CNS% or the OTU%.
O
2
%
Oxygen percentage oroxygen fraction inthe breathing gas.Standard air
has 21% oxygen.
Oxygen partial pressure
Limits themaximumdepth towhich thenitrox mixturecanbe safelyused.
The maximum partialpressure limit for enrichedair diving is 1.4bar. The
contingency partial pressure limit is 1.6 bar. Dives beyond this limit risk
immediate oxygen toxicity.
PO
2
Abbreviation for oxygen partial pressure.
RGBM
Abbreviation for Reduced Gradient Bubble Model.
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