(Comp.sys.handhelds)
Item: 1771 by jn190068 at longs.LANCE.ColoState.EDU
Author: [Jay Nestle]
  Subj: Std Air Tables
  Date: Tue Jan 22 1991 15:11 

        Following is the documentation file for my program
that calculated temp, pressure, and density of air at 
altitudes from 0m to 105,000m.  Following this is a post of
the downloadable source for the hp48.

This program by:  Jay Nestle, January 1991  Colorado State University

        This program uses several algorithms to calculate the temperature,
pressure, and density of air at a certain altitude.  The algorithm was adapted
from Introduction to flight, third edition.  The standard atmosphere calculated
is a common one used throughout the aerospace industry.  The original model
was the 1959 ARDC (the U.S. Air Force's previous Air Research and Development
Command).  The algorithms are outlined in the above mentioned text on pages 74
through page 77.

        This should be useful to anyone who constantly uses tables to look up
temp, pressure, and density from altitudes from 0m to 105000m.  The program is
not copyrighted and can be freely distributed.  I hope someone can make use of
it.

        The custom menu is only an example of what someone might wish to use.
Please feel free to use or not use this CST menu.  Without the CST just press
run and the program will start, likewise with the CST.  Without the CST the
program is less than 2K.

        Units used:  SI system
        ----------   ---------
        Temp            K
        Pressure        Pa
        Density         kg/m^3
        Height          m

        Further modifications could be made to give English units fairly
easy.  The program simply checks for what altitude is desired and then uses
the correct algorithm for that altitude region, modifying the lapse rate, A
and the various other starting point constants.