From 0
to 11 km (0 to 36,000 ft), the Density Altitude is given by:
where T
o = 288.15 K, LR= -6.5 K/km,
o = 1.225 kg/m
3,
R
d = 287.053 J/kg K,
45 =9.80665 m/s2,
and = 0.622004944.
From 11 to 20 km (36,000 to 65,600
ft), the Density Altitude is given by:
where zo = 11 km, T
o = 216.65 K, p
o =
226.3206 hPa, R
d = 287.053 J/kg K,
45 =9.80665
m/s2, and
= 0.622004944.