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Re: [new_distillers] Boiling Point vs Altitude Correction Table

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  • Robert Thomas
    Harry, that is really nice, but is it perhaps a little distracting? I mean in the sense that we really ought to be concentrating on column stability not
    Message 1 of 3 , Jan 2, 2007
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      Harry,
      that is really nice, but is it perhaps a little distracting? I mean in
      the sense that we really ought to be concentrating on column stability
      not accurate measurement. Ah, but then to answer my own question, is
      this for pot-stills?
      Then a further question, I bet most peops are using electronic
      thermometers. These say resolution X, accuracy Y (where X > Y usually).
      Is there an idiots guide (for peops like me) as to what my reading
      compares to the real temp?
      I think it is confusing.
      cheers
      Rob.

      --- Harry <gnikomson2000@...> wrote:

      >
      > To calculate the boiling point of water at a location on any
      > specific
      > day use the following equation: Boiling point of water = Boiling
      > point
      > at specified altitude (Table 1) ± boiling point barometric correction
      > (Table 2).
      > In the tables, the following equations have been used: Pressure (in.
      > Hg) = 29.921* (1-6.8753*0.000001 * altitude, ft.)^5.2559 Boiling
      > point =
      > 49.161 * Ln (in. Hg) + 44.932 TABLE 1 Changes in
      > Standard
      > Temperature and Pressure (in Hg) as a Function of Altitude (Ref.
      > 1)
      > TABLE 2 Boiling Point as a Function of Barometric Pressure
      > (Ref. 2) Altitude (ft.) Pressure (in. Hg) Boiling pt. (° F)
      > Pressure (in. Hg) Boiling pt. (° F) Boiling pt. [added or reduced]
      > (° F) -500 30.466 212.9 27.6 208.04 -3.96 0 29.921
      > 212.0 27.8 208.39 -3.61 500 29.384 211.1 28.0 208.75
      > -3.25 1000 28.855 210.2 28.2 209.10 -2.90 2000 27.821
      > 208.4 28.4 209.44 -2.56 2500 27.315 207.5 28.6 209.79
      > -2.21 3000 26.817 206.6 28.8 210.13 -1.87 3500 26.326
      > 205.7 29.0 210.47 -1.53 4000 25.842 204.8 29.2 210.81
      > -1.19 4500 25.365 203.9 29.4 211.15 -0.85 5000 24.896
      > 203.0 29.6 211.48 -0.52 5500 24.434 202.0 29.8 211.81
      > -0.19 6000 23.978 201.1 29.921 212.00 0.00 6500 23.530
      > 200.2 30.0 212.14 0.14 7000 23.088 199.3 30.2 212.46
      > 0.46 7500 22.653 198.3 30.4 212.79 0.79 8000 22.225
      > 197.4
      > 30.6 213.11 1.11 8500 21.803 196.4 30.8 213.43 1.43
      > 9000
      > 21.388 195.5 31.0 213.75 1.75 9500 20.979 194.6 31.2
      > 214.07 2.07 10000 20.577 193.6 31.4 214.38 2.38
      >
      >
      > [ Source: http://www.hi-tm.com/Documents/Calib-boil.html
      > <http://www.hi-tm.com/Documents/Calib-boil.html> ]
      >
      >
      >
      > Slainte!
      >
      > regards Harry
      >
      >


      Cheers,
      Rob.

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    • Harry
      ... mean in ... stability ... & Happy New Year to you also, and everyone. You re right of course, Rob. I posted it in response to an earlier poster who was
      Message 2 of 3 , Jan 2, 2007
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        --- In new_distillers@yahoogroups.com, Robert Thomas
        <whosbrewing@...> wrote:
        >
        > Harry,
        > that is really nice, but is it perhaps a little distracting? I
        mean in
        > the sense that we really ought to be concentrating on column
        stability
        > not accurate measurement.



        & Happy New Year to you also, and everyone.
        You're right of course, Rob. I posted it in response to an earlier
        poster who was trying to calculate the BP. He's 6000 ft up.

        In truth, the BP will be whatever it is for that altitude, that
        barometric pressure, that instrument accuracy, and above all...that
        particular mixture of water, solvents, & congeners. As long as the
        reading is steady. Another good reason for keeping meticulous run
        records, at least while one is figuring out their particular still &
        location.


        Slainte!
        regards Harry
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