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Non-invasive ventilation (NIV) is the use of breathing support administered through a face mask, nasal mask, or a helmet.Air, usually with added oxygen, is given through the mask under positive pressure; generally the amount of pressure is alternated depending on whether someone is breathing in or out.
Oxygen cycles are 20 minutes, and air breaks 5 minutes. The full Catalina Table allows for up to 5 extensions at 60 fsw. [18] Shorter versions include: 3 oxygen cycles at 60 fsw followed by a minimum of 6 oxygen cycles at 30 fsw. (equivalent to USN Table 6) 4 oxygen cycles at 60 fsw followed by a minimum of 9 oxygen cycles at 30 fsw.
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Temperatures on the order of 10 9 kelvins are needed to fuse oxygen into sulfur. [11] An atomic mass of 16 was assigned to oxygen prior to the definition of the unified atomic mass unit based on 12 C. [12] Since physicists referred to 16 O only, while chemists meant the natural mix of isotopes, this led to slightly different mass scales.
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