Hi bio161,
Since TAS depends on a density correction applied to IAS, and LSS varies with temperature (which affects Density Altitude), the net result is that temperature is cancelled out.
i.e. Even if the temperature is different from ISA, for a given IAS at a given FL (But your Density Altitude will be different) = the same Mach Number.
ASI measures (Pitot dynamic + static pressure) - (Pitot static pressure) = ( Pt - Ps)
Machmeter measures (Pt-Ps) / Ps.
Last edited by rudderrudderrat; 15th September 2010 at 09:49.
Reason: punctuation for clarity