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Term Explanation
pO
2
Partial pressure of 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. The
contingency partial pressure limit is 1.6
bar. Dives beyond this limit risk
immediate oxygen toxicity.
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.
RGBM
Reduced gradient bubble model.
Modern algorithm for tracking both
dissolved and free gas in divers.
SCR
Semi-closed rebreather. Scuba that
recycles a portion of exhaled gas.
Scuba
Self-contained underwater breathing
apparatus.
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