From: earlcp@idirect.com   
      
   gdpusch@NO.xnet.SPAM.com (Gordon D. Pusch) :   
      
   > henry@spsystems.net (Henry Spencer) writes:   
   >   
   > > In article <3f64d304$0$173$edfadb0f@dread11.news.tele.dk>,   
   > > Jens Kieffer-Olsen  wrote:   
   > >>>> I take it that gravity on Mars being a mere 38% of that in the   
   > >>>> experiment has little bearing on the evaporation rate?   
   > >>> Very little.  And as a practical matter, it's virtually impossible to   
   > >>> reproduce that anyway...   
   > >>   
   > >> Airplanes in free fall are used to produce brief periods of zero   
   > >> gravity, so why not let a slight trust emulate .38G?   
   > >   
   > > No need for a slight thrust; emulating lunar or Martian gravity is just   
   > > a matter of flying a slightly shallower parabola.  It's been done   
   > > occasionally.  But the available time at reduced G is too short for   
   > > some things; I think it would be quite a trick to get measurements of   
   > > things like this in the time available.   
   >   
   > Moreover, there is ABSOLUTELY NO REASON to believe reduced gravity should   
   > have any effect on the evaporation rate of water, any more than it would   
   > affect the boiling point or freezing point of water.   
   >   
   > Gravity is quite simply UTTERLY IRRELEVANT to any process governed by   
   > microscale physics. Gravitation is only important when bodies are large   
   > and/or all other accelerations are small --- neither of which are true   
   > of individual molecules of water.   
      
   Sorry, you are wrong.  If a large body of water is boiling in a low pressure   
   enviroment the portion of the water that is boiling is the water under less   
   pressure than it's vapor pressure at it's temperture.  With a large/deep body   
   of water the gravity in part determines how far down the water is boiling.   
   The less the gravity, the more that boils at a time.   
      
                  Earl Colby Pottinger   
      
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