XPost: sci.space.policy, sci.physics   
   From: fjmccall@gmail.com   
      
   jimp@specsol.spam.sux.com wrote:   
      
   >In sci.physics Fred J. McCall  wrote:   
   >   
   >   
   >   
   >> Really?  You think we breath NITROGEN?  Uh, no.  We just use the   
   >> oxygen.   
   >   
   >We use the oxygen but what we breath is 78% nitrogen.   
   >   
      
   And what we breath out has the same amount of nitrogen in it, so you   
   don't need any more but to replace leakage.  And nothing says you HAVE   
   to use nitrogen for the inert component of atmosphere or that you have   
   to run 15 psi.   
      
      
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