Pitot Tube Stability True Airspeed 
Pilot Institute
JULY 11, 2025
Key Takeaways Mach number is a dimensionless ratio of true airspeed to local speed of sound. Mach number is simply a ratio of your true airspeed to the local speed of sound. When you reach around 36,000 feet (11,000 m) near the tropopause, the temperature stabilizes at around -56.5 °C. Here’s why.
Pilot Institute
NOVEMBER 16, 2024
If you’re aiming to get comfortable with managing both airspeed and altitude in flight, you’ll need to understand the difference between indicated airspeed (IAS) and true airspeed (TAS). Key Takeaways Airspeed and altitude are directly linked to each other throughout different phases of your flight.
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