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O
2
% Oxygen percentage or oxygen fraction in
the breathing gas. Standard air has 21%
oxygen.
Oxygen partial pressure Limits the maximum depth to which the
used Nitrox mixture can safely be used. The
maximum partial pressure limit for enriched
air diving is 1.4 bar. The contingency partial
pressure limit is 1.6 bar. Dives beyond this
limit have the risk for immediate oxygen
toxicity.
PO
2
Abbreviation for oxygen partial pressure.
RGBM Abbreviation for Reduced Gradient Bubble
Model.
Reduced Gradient Bubble Model
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.
SURF TIME Abbreviation for surface interval time.
Surface interval time Elapsed time between surfacing from a dive
and beginning a descent for the subsequent
repetitive dive.