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Half time
He%
HP
MOD
Multi level dive
Nitrox
NOAA
No decompression time
No decompression dive
NO DEC TIME
OEA = EAN = EANx
OLF
OTU
Oxygen tolerance unit
After a change in ambient pressure, the amount of time required for the
partial pressure of nitrogen in a theoretical compartment to go half way
from its previous value to saturation at the new ambient pressure.
Helium percentage or helium fraction in the breathing gas.
Abbreviation for high pressure (= cylinder pressure).
The maximum operating depth of a breathing gas is the depth at which
the partial pressure of oxygen (PO2) of the gas mix exceeds a safe limit.
A single or repetitive dive that includes time spent at various depths and
whose no decompression limits are therefore not determined solely by
the maximum depth attained.
In sports diving, refers to any mix with a higher fraction of oxygen than
standard air.
United States National Oceanic and Atmospheric Administration.
The maximum amount of time a diver may remain at a particular depth
without having to make decompression stops during the subsequent as-
cent.
Any dive which permits a direct, uninterrupted ascent to the surface at
any time.
Abbreviation for no decompression time limit.
Abbreviations for oxygen enriched air nitrox.
Abbreviation for oxygen limit fraction.
Abbreviation for oxygen tolerance unit.
Used to measure the whole-body-toxicity.
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