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Term
OLF%
O 2 %
Partial pressure
of oxygen (O2)
Reduced
gradient
bubble model
(RGBM)
Repetitive dive
Residual
nitrogen
Scuba
Surface time
What it means
Oxygen limit fraction. The diver's current oxygen
toxicity exposure.
Oxygen percentage or oxygen fraction in the
breathing gas. Standard air has 21% oxygen.
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.
Modern algorithm for tracking both dissolved
and free gas in divers.
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.
Self-contained underwater breathing apparatus.
Elapsed time between surfacing from a dive and
beginning a descent for the subsequent dive.
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