Average values of pressure (atm) corresponding to altitude (km) [values taken by NASA]: km:   0,   1,   2,   4,   6,   8,   10,   15,   20,   30 atm: 1,0.886,0.785,0.608,0.465,0.35,0.26,0.115,0.069,0.012 The cubic functions that "best" approximates: P = -6.9e-05*A*A*A+0.00482*A*A-0.115*A+0.998

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