XPost: sci.space.policy, sci.physics   
   From: jfindley@cinci.nospam.rr.com   
      
   In article ,   
   mooregr@deletethisgreenms.com says...   
   >   
   > "Serigo"  wrote in message news:ntqvjd$1eq3$1@gioia.aioe.org...   
   > >   
   > >On 10/13/2016 1:36 PM, Serigo wrote:   
   > >>   
   > >>>>   
   > >>>> 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   
   > >>>   
   > >>   
   > >> Great, that problem solved.   
   > >   
   > >ISS uses 14.7psi about 70% O2   
   >   
   > That's in accurate. It's about 78% N2 and 21% O2, the rest is Co2 and a few   
   > other gasses.   
   > They purposely made it as close to the Earth's standard ratio so that   
   > replicating experiments was easier.   
   > https://www.quora.com/What-is-the-composition-of-breathing-air-in-ISS   
      
   Earth standard at sea level.  Denver Colorado is more like 12 psi, and   
   I'd still consider that "earth standard".  So the actual pressure is   
   kind-of arbitrary.  People live just fine at a range of pressures.   
      
   Jeff   
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