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Partial pressure of
oxygen (PPO
2
)
The total pressure exerted by oxygen in a breathing mix. It is a
measurement of the concentration of oxygen in a gas mixture. PPO
2
levels
are determined by the percentage of oxygen in a gas mixture and the
depth at which a diver breathes the gas. A PPO
2
level above 1.6 bar is
considered extremely dangerous and may be toxic.
Residual nitrogen The amount of excess nitrogen remaining in a diver’s body after one or
more dives.
Safety Factor The level of conservativeness of the decompression algorithm. This allows
the user to select a standard decompression algorithm, a conservative
algorithm or a progressive algorithm.
Stop Countdown
Time
The amount of time required to complete a safety stop or a mandatory
decompression stop.
Surface interval The amount of time that elapses between surfacing from a dive and
beginning a new dive.
SECTION 9 – GLOSSARY
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