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Date: Fri, 30 Mar 2001 09:11:45 -0800 (PST)
From: p farina <lostdiver61@ya*.co*>
Subject: Re: Deco planner at altitude
To: techdiver@aquanaut.com
If you want to get a bit more dead nuts you can use
the following to get a "Standard Day" ambient (amb)
pressure.  Take note, this does not take into account
actual day conditions of high or low pressures which
are real world.  This will get you close on an
average, 
sunny, windless, calm.... day.

To calculate the standard atmospheric pressure you 
can use the following, as long as your altitude is 
less than 36089 ft 

Pamb in psi= 14.69595 (1-(0.0019812/288.15)ALT)^5.2561

to convert to mb use the following

Pamb in mb = (Pamb in psi)(1000)/14.504

/\/\/\/\/\/\//\/\/\/\/\/

as for whether one should use mb, mB, millibar, BAR

Hey I just use the Pratt & Whitney Aeronautical
Vestpocket Handbook circe 1986 for the conversions
in my previous post.  That lists convserions for
"bar"  and crosschecking a CRC gets the same answer.
I can swing with mb or mb or even the third one.
Just as long as we are all clear that BAR is a
proprietary name for Browning Automatic Rifle.

pf



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