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2. Fraction of inspired oxygen - Wikipedia

   en.wikipedia.org/wiki/Fraction_of_Inspired_Oxygen

   Fraction of inspired oxygen (F I O 2), correctly denoted with a capital I, [1] is the molar or volumetric fraction of oxygen in the inhaled gas. Medical patients experiencing difficulty breathing are provided with oxygen-enriched air, which means a higher-than-atmospheric F I O 2. Natural air includes 21% oxygen, which is equivalent to F I O 2 ...

3. Maximum operating depth - Wikipedia

   en.wikipedia.org/wiki/Maximum_operating_depth

   In which pO 2 is the chosen maximum partial pressure of oxygen in atmospheres absolute and the FO 2 is the fraction of oxygen in the mixture. For example, if a gas contains 36% oxygen (FO 2 = 0.36) and the limiting maximum pO 2 is chosen at 1.4 atmospheres absolute, the MOD in feet of seawater (fsw) [ Notes 1 ] is 33 fsw/atm x [(1.4 ata / 0.36 ...

4. Air separation - Wikipedia

   en.wikipedia.org/wiki/Air_separation

   For example, a number of approaches are being explored for oxygen generation. Polymeric membranes operating at ambient or warm temperatures, for example, may be able to produce oxygen-enriched air (25-50% oxygen). Ceramic membranes can provide high-purity oxygen (90% or more) but require higher temperatures (800-900 deg C) to operate.

5. Nitrox - Wikipedia

   en.wikipedia.org/wiki/Nitrox

   Enriched Air Nitrox" or "EAN", and "Oxygen Enriched Air" are used to emphasize richer than air mixtures. [3] In "EANx", the "x" was originally the x of nitrox, [ 11 ] but has come to indicate the percentage of oxygen in the mix and is replaced by a number when the percentage is known; for example, a 40% oxygen mix is called EAN40.

6. Breathing gas - Wikipedia

   en.wikipedia.org/wiki/Breathing_gas

   A breathing gas is a mixture of gaseous chemical elements and compounds used for respiration. Air is the most common and only natural breathing gas. Other mixtures of gases, or pure oxygen, are also used in breathing equipment and enclosed habitats such as scuba equipment, surface supplied diving equipment, recompression chambers, high-altitude mountaineering, high-flying aircraft, submarines ...

7. Hyperbaric treatment schedules - Wikipedia

   en.wikipedia.org/wiki/Hyperbaric_treatment_schedules

   Oxygen enriched treatment gases and Oxygen may be used. Air may be used if nothing better is available. If oxygen breathing is interrupted no compensation to the times is required. Oxygen partial pressure may not exceed 3 ata (3 bar). Maximum depth 165 fsw (50 msw) Time at 165 fsw optional from 30 minutes to 2 hours including compression