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1 Bar = 14.504psi Mega (M) is X10^6 or X1000000 Kilo (k)is X10^3 or X1000 Mili (m) is X10^-3 or X0.001 1 inch of Hg = .49116 psi (most weather stations in the US give barometer reading in inches of Mercury) Sea level atmoshpheric conditionson a standard day is 14.69595psi or 29.982 inHg. The deco planner software has a Preference default of 1013.25MB which one could believe this to mean Mega. This is an outrageous pressure on the order of 10,000,000,000 psi. Looking in the Help menu we find that the Preference Box should be lower case "mb" instead of "MB" "Surface Pressure mb This is the known ambient surface pressure, if the actual surface pressure is not known, it is recommended that this be set to 1000mb. Although this setting can be set to 0mb, the algorithms are not tested to this low ambient pressure and the program may produce unacceptable results. This document is the property of the Decoplanner Development team." thus (1013.25)(0.001)(14.504) = 14.696 psi close enough to sea level checking units: (mbar)(1/m)(psi/bar) = psi From the US Standard Atmosphere, 1962 (Geopotential Altitude) chart you can get the following (I have created the mb column and the 365ft point) ALT(feet) psi mb -1000 15.23 1050.06 0 14.70 1013.51 365 14.50 1000.00 1000 14.17 976.97 2000 13.66 941.81 5000 12.23 843.22 6000 11.78 812.19 7000 11.34 781.85 8000 10.92 752.90 9000 10.50 723.94 10000 10.11 697.05 12000 9.346 644.37 15000 8.294 571.84 20000 6.754 465.66 30000 4.364 300.88 hope that helps, patrick --- Rich Gulley <richgulley@us*.ne*> wrote: > I would like some advice on using Deco planner at > altitude. I am not real sure where to set the > Ambient surface pressure : MB on the preferences tab > for a given altitude. > > Any help would be great. > Thanks Rich > > __________________________________________________ Do You Yahoo!? Get email at your own domain with Yahoo! Mail. http://personal.mail.yahoo.com/?.refer=text -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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