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Half time
After a changein ambient pressure, the amount of time required for the
partial pressure of nitrogen in a theoretical compartment to go half way
from its previousvalue tosaturation atthe new ambientpressure.
HP
Abbreviation for highpressure (=cylinder pressure).
Multi level dive
A single or repetitive divethat includes timespent at variousdepths and
whose no decompression limits are therefore not determined solely by
the maximum depthattained.
Nitrox
In sports diving, refers to any mix with a higher fraction of oxygen than
standard air.
NOAA
United States NationalOceanic andAtmospheric Administration.
No decompression time
The maximum amount of time a divermay remain at a particular depth
without having to make decompression stops during the subsequent
ascent.
No decompression dive
Any dive which permits a direct, uninterrupted ascent to the surface at
any time.
NO DEC TIME
Abbreviation for nodecompression timelimit.
OEA = EAN= EANx
Abbreviations for oxygenenriched airnitrox.
OLF
Abbreviation for oxygenlimit fraction.
OTU
Abbreviation for oxygentolerance unit.
Oxygen tolerance unit
Used to measurethe whole-body-toxicity.
Oxygen limit fraction
A term used by Suunto for the values displayed in the oxygen toxicity
bargraph. The valueis eitherthe CNS%or the OTU%.
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