Dive Terminology
- Air time remaining (ATR)
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The time you may remain at the current depth until an ascent at 9 m/min. (30 ft./min.) would result in surfacing with the reserve pressure.
- Pressure-based surface air consumption (PSAC)
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The change in pressure over time, normalized to 1 ATM.
- Respiratory minute volume (RMV)
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The change in gas volume at ambient pressure over time.
- Volumetric surface air consumption (SAC)
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The change in gas volume over time, normalized to 1 ATM.