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Octopus Regulator
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An alternate second stage air source used by a diver's buddy in an out-of-air situation, or reserve 2nd stage regulator.
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OEA
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Oxygen enriched air - synonym for nitrox.
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Open circuit scuba
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Apparatus used in recreational diving. Exhaled air is expelled into the water as bubbles, no part is re-breathed by the diver.
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Open-Water Diving
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The recreational diving done in an environment other than a swimming pool but with no overhead obstacles; examples include lakes, ponds, rivers, oceans, quarries.
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Oxygen
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Often seen as using the chemistry abbreviation 02, gas vital for all life on this planet; makes up about 21% of the air by volume.
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Oxygen Therapy
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Administration of any gas, for medical purposes, that contains more than 21% oxygen.
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Oxygen Toxicity
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Damage or injury from inhaling too much oxygen; can arise from either too high an oxygen concentration or oxygen pressure. One of the most dramatic manifestations of oxygen toxicity while diving can be seizure.
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Oxygen Window
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Difference between total gas pressures in arterial and venous blood; exist because oxygen is partly metabolized by the tissues, so venous oxygen pressure is lower than arterial oxygen pressure.
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