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Term What it means
O
2
%
Oxygen percentage or oxygen fraction in the
breathing gas. Standard air has 21% oxygen.
Partial pressure
of oxygen (O2)
Limits the maximum depth to which the nitrox
mixture can be safely used. The maximum partial
pressure limit for enriched air diving is 1.4 bar (20
psi). The contingency partial pressure limit is 1.6
bar (23 psi). Dives beyond this limit risk
immediate oxygen toxicity.
Reduced
gradient
bubble model
(RGBM)
Modern algorithm for tracking both dissolved
and free gas in divers.
Repetitive dive
Any dive whose decompression time limits are
affected by residual nitrogen absorbed during
previous dives.
Residual
nitrogen
The amount of excess nitrogen remaining in a
diver after one or more dives.
Scuba Self-contained underwater breathing apparatus.
Surface time
Elapsed time between surfacing from a dive and
beginning a descent for the subsequent dive.
Tissue group
Theoretical concept used to model bodily tissues
for the construction of decompression tables or
calculations.
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