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Dive series A group of repetitive dives between which the dive
computer indicates some nitrogen loading is present.
When nitrogen loading reaches zero the dive com-
puter deactivates.
Dive time Elapsed time between leaving the surface to descend,
and returning to the surface at the end of a dive.
EAD Abbreviation for equivalent air depth.
EAN Abbreviation for enriched air nitrox.
Enriched Air Nitrox Also called Nitrox or Enriched Air = EANx. Air that
has some oxygen added. Standard mixes are EAN32
(NOAA Nitrox I = NN I) and EAN36 (NOAA Nitrox
II = NN II).
Equivalent Air Depth Nitrogen partial pressure equivalent table.
Floor The deepest depth during a decompression stop dive
at which decompression takes place.
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 pre-
vious value to saturation at the new ambient 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 frac-
tion 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 decom-
pression 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.
