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| Q. |
Which of the following gases is mixed with oxygen for breathing by divers in aqualungs? |
| A. | Methane |
| B. | Nitrogen |
| C. | Helium |
| D. | Hydrogen |
| Answer» B. Nitrogen | |
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Explanation: For some diving, has mixtures other than normal atmospheric air (21 % oxygen, 78% nitrogen, 1% trace gases) can be used, so long as the diver is properly trained in their use. The most commonly used mixture is Nitrox, also referred to as Enriched Air Nitrox (EAN), whichis air with extra oxygen, often with 32% or 36% oxygen, and thus less nitrogen, reducing the likelihood of decompression sickness or allowing longer exposure to the same pressure for equal risk. |
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