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Re: [Distillers] Condensation

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  • Reima
    Damned beautiful stuff that water, fancy if it got heavier and heavier the cooler it got as most everything else does, then all them fishes in lakes would be
    Message 1 of 8 , Jun 28, 2003
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      Damned beautiful stuff that water, fancy if it got heavier and heavier the cooler it got as most everything else does, then all them fishes in lakes would be frozen stiff never to be seen again ;-)
      Reima
      ----- Original Message -----
      Sent: Sunday, June 29, 2003 10:02 AM
      Subject: Re: [Distillers] Condensation

      Ludwig wrote:
      Subject: Re: [Distillers] Condensation

      Let me rephrase, water boils at 100C and freezes at 0C at room pressure. 
      If the pressure was increased to 5 Atm or 8 atms (110 to 120 PSI) (74 to 118) then what would the boiling and freezing temps be? Would their still be 100 degrees difference between them.  What if a vacuum was added, let's say .8 atm (24 inches of mercury).  Would their still be 100 degree difference between the BP and the FP.
      If pressure is increased then the bp is raised, and at 10 Atm will be around 117C (see rough graph attached).
      In fact, with water, the freezing point also rises (very slightly) with pressure as water is an odd one ... it expands when it freezes and this mucks things around a bit.  Lucky for ice-hockey players!  I've exaggerated that on the graph.  However, for all practical purposes, take the freezing point as remaining essentially constant at 0C.  You can follow on the graph the lowering in bp as pressure decreases, and see that below the triple point at around 0.005 Atm you can't have liquid at all, only ice or vapor.  Below that point it's all sublimation, not boiling.  Bottom line ... as the pressure lowers, the degrees difference between freezing and boiling point increases, and as the pressure increases then the degrees difference decreases, reaching zero at the triple point.

      Thanks for clearing up that freezing thing.  I thought Mike said once that the freezing temp never changed.  It has really bothered me ever since.  Just couldn't understand how this could be.
      I may well have once said that Johan ... I've frequently said stupid things :-)
      Mike N

       


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