CAS
EAS TAS
/MN
Altitude
At constant CAS
As altitude increases
Speed TAS & MN increase
Or:
CAS is a measure of dynamic pressure = ˝ρV2
Where ρ = air density (decreasing in climb) and V = TAS (increasing to keep CAS constant)
LSS is constant in isothermal conditions (temperature constant)
MN = TAS/LSS = Increasing/Constant = Increasing