Re: [compost_tea] Re: barometric pressure and compost tea Oxygen levels

From: David Loring <dloring3_at_cox.net>
Date: Wed, 8 Oct 2003 17:06:24 -0700

Tom - Using the chart you provided and the data for todays barometric press=
ure across the USA the correction factor could not be more than 5 percent a=
nywhere in the US just for barometric pressure. The barometric pressure li=
nes went from a low of 984 to a high of 1020. That's 36mb or a change equa=
l to an altitide difference of just over 1,000 feet. Barometric pressure c=
hanges would not seem to have influences of more than plus or minus 0.5ppm =
dissolved Oxygen unless there is a heck of a storm. Stop making me do so m=
uch math :-} Is the math right . . . any mountain climbers in the group?

Dave


  ----- Original Message -----
  From: tomjasz
  To: compost_tea_at_yahoogroups.com
  Sent: Wednesday, October 08, 2003 2:28 PM
  Subject: [compost_tea] Re: barometric pressure and compost tea Oxygen lev=
els


  http://www.livesoil.com/do.htm

  Dissolved Oxygen Percent Saturation Correction

  --- In compost_tea_at_yahoogroups.com, "dloring3" <dloring3_at_c...> wrote:
> To the question of how barometric pressure changes might affect
> Oxygen reading in tea.
>
> A large jump in barometric pressure from 29 to 30 would have the
  same
> affect as changing altitude 1,000 feet.
>
> see http://www.nfinity.com/~exile/howhigh.htm
>
> The chart with my dissolved Oxygen meter is in meters but 300
  meters
> is about 1000 feet and the change at room temperature would only be
> 0.3ppm. This is not going to account for the differences in Kirk's
> readings, it must be something else.
>
> Dave Sotillo 50


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Received on Thu Oct 09 2003 - 21:34:50 EDT

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