cb4d01a0-1cf9-4e3e-ba62-3ee5e2a35780 13 6 9 decimal

&[DATE] &[TIME] - &[FILENAME]

Standard Atmospere: altitude/pressure

1. Upper segment: altitude [km] vs measured kPa

x β kPa20 β 1 el β 2 el x β 3 el / - exp * + :

y x β kPa20 ≡ x solve maple y β 1 el - β 2 el / ln β 3 el * -

altitude [km]vs kPa p β altitude p β 1 el - β 2 el / ln β 3 el * - :

β 0.02264 127.8954 6.35874 31 mat :

11 β kPa20 20 β kPa20 21 mat 22.7 5.53 21 mat

x β kPa20 11 x ≤ (x 20 ≤ (& β 1 el β 2 el x β 3 el / - exp * + not OIAC if :

x β altitude 5.53 x ≤ (x 22.7 ≤ (& x β 1 el - β 2 el / ln β 3 el * - not OIAC if :

blue => kPa vs altitude [km] ...OIAC red => km vs measured pressure [kPa]

x β kPa20 x β altitude 2 1 sys

from measured kPa [5.5..22.7] 'y' is your altitude [km]

x β altitude 2 1 sys

2. Lower segment: altitude [m] vs measured Pa

Altitude[m] vs pressure [Pa x β H 22700 x ≤ (x 107477 ≤ (& β 1 el 1 x 101325 / (β 2 el^(- (* next segment if :

β 44330.77 0.190263 21 mat :

x β H

@ 107477Pa you are at -500m below sea level