XPost: sci.space.policy, sci.physics, rec.arts.sf.science   
   From: gossg@gossg.org   
      
   "Robert Clark"  wrote:   
      
      
   >BTW, since this is in regards to "The Martian", for you chemistry heads out   
   >there, are there some foods, liquids, or common materials that might be on   
   >the shuttles that could have filtered out the CO2 in air other than the   
   >lithium canisters? For instance perhaps the solubility of CO2 in water is   
   >different than in O2 and there could have been a way to separate out the CO2   
   >from the air that way.   
      
   There's lots of cold available, and low pressure that should make   
   refrigeration easy.  I'm not sure how "industrial" you have to get to   
   freeze CO2 out of the air, but it should be workable.  Fire   
   extinguishers generate CO2 snow fairly cheaply.   
   --   
   We are geeks.  Resistance is voltage over current.   
      
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