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Half-time 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.
HP Abbreviation for high pressure (= cylinder
pressure).
Multi-level dive 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.
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 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 no-decompression time limit.
OEA = EAN = EANx Abbreviation for Oxygen Enriched Air Nitrox.
OLF Abbreviation for Oxygen Limit Fraction.
OTU Abbreviation for Oxygen Tolerance Unit.
Oxygen Tolerance Unit Is used to measure the Whole-Body-Toxicity.
Oxygen Limit Fraction A term used by SUUNTO for the values
displayed in the Oxygen Toxicity bargraph.
The value is either the CNS% or the OTU%.