XPost: sci.space.policy, sci.physics   
   From: jfindley@cinci.nospam.rr.com   
      
   In article , invalid@invalid.com says...   
   >   
   > On 10/12/2016 3:09 PM, Fred J. McCall wrote:   
   > > 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.   
   > >   
   > >   
   >   
   > what else are you going to use ?  do you have any ideas ?   
   >   
   > N2 is the only practical one.   
   >   
   > and you have to take a lot of it,   
   >   
   > all in *high pressure heavy* tanks.   
   >   
   > do you have an alternate inert gas in mind ?   
      
   Yes, already tested.   
      
   Actually, look at the Skylab atmosphere.  It used a a 74-percent oxygen   
   and 26-percent nitrogen breathing mixture at a mere 5 psi instead of the   
   "normal" 14.7 psi, which is earth sea level pressure.   
      
   http://history.nasa.gov/SP-400/ch2.htm   
      
   Jeff   
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