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Oxygen tanks for diving

  1. Jul 19, 2005 #1
    Why do scuba divers need oxygen tanks if air is already dissolved in the water? Why can't they just undissolve the trapped gas like when you shake up a bottle of carbonated soda?
     
  2. jcsd
  3. Jul 19, 2005 #2

    Borek

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    Staff: Mentor

    Soda bottle is oversaturated (once opened). Partial pressure of oxygen in water is too low in normal conditions for the oxygen to be easily taken out from the water. But IIRC it is done on the submerged submarines.
     
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