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Scuba Kit Gas Composition

  1. Mar 22, 2016 #1
    I read in my text book that Scuba kit has mixture of air such as nitrogen hydrogen and oxygen sometimes even helium is used instead of nitrogen. As pressure increases going deep in oceans, solubility of gas in liquid increases. So oxygen starts to dissolve quickly. But I don't understand why other gases are being used. Why can't scuba kit be filled completely of oxygen? I think it can stop joint pain as nitrogen will not be present. Any reasons why it isn't completely filled with oxygen but mixture of gases are used? Please help me
     
  2. jcsd
  3. Mar 22, 2016 #2

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    Google "oxygen toxicity."
     
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