XPost: sci.space.policy, sci.physics   
   From: fjmccall@gmail.com   
      
   Serigo  wrote:   
      
   >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 ?   
   >   
      
   You can use anything you like, as long as it's non-toxic.  Or you can   
   use nothing at all.   
      
   >   
   >N2 is the only practical one.   
   >   
      
   No, but it's probably the simplest and cheapest.   
      
   >   
   >and you have to take a lot of it,   
   >   
      
   Not really.  After all, it's not consumed so you really just need   
   enough to fill the people spaces plus a little left over for 'make up   
   gas'.  There's nitrogen on Mars, so you don't need to haul it all in.   
   Or you could just use pure oxygen, if you're willing to accept the   
   fire danger.   
      
   >   
   >all in *high pressure heavy* tanks.   
   >   
      
   Oh, don't be silly.   
      
   >   
   >do you have an alternate inert gas in mind ?   
   >   
      
   You don't absolutely need an inert gas, but you could just take both   
   the nitrogen and argon out of the Martian atmosphere and use that.  Or   
   you could get nitrogen from nitrogenous regolith.   
      
      
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