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Suunto EON Steel
Term
No decompression dive
No dec time
OC
OTU
O
%
2
pO
2
Repetitive dive
Residual nitrogen
RGBM
Scuba
Surface time
Tissue group
Trimix
50
Explanation
having to make decompression stops during the
subsequent ascent.
Any dive which permits a direct, uninterrupted ascent to
the surface at any time.
Abbreviation for no decompression time limit.
Open-circuit. Scuba that exhausts all exhaled gas.
Oxygen tolerance unit. Used to measure the whole-
body-toxicity, caused by prolonged exposure to high
oxygen partial pressures. The most common symptoms
are irritation in the lungs, a burning sensation in the
chest, coughing and reduction of the vital capacity.
Oxygen percentage or oxygen fraction in the breathing
gas. Standard air has 21% oxygen.
Partial pressure of oxygen. Limits the maximum depth to
which the gas mixture can be safely used. The
contingency partial pressure limit is 1.6 bar. Dives
beyond this limit risk immediate oxygen toxicity.
Any dive whose decompression time limits are affected
by residual nitrogen absorbed during previous dives.
The amount of excess nitrogen remaining in a diver
after one or more dives.
Reduced gradient bubble model. Modern algorithm for
tracking both dissolved and free gas in divers.
Self-contained underwater breathing apparatus.
Elapsed time between surfacing from a dive and
beginning a descent for the subsequent dive.
Theoretical concept used to model bodily tissues for the
construction of decompression tables or calculations.
A breathing gas mix of helium, oxygen and nitrogen.
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