Quick Facts
- Type
- Altitude Reference
- Definition
- The altitude indicated when the altimeter is set to the standard datum of 29
- Used By
- Pilots
Definition#
Pressure altitude is the altitude shown on an altimeter when it is set to the standard barometric pressure of 29.92 inches of mercury (1013.25 hPa). It represents altitude in the standard atmosphere.
Why It Matters Operationally#
Above the transition altitude, all aircraft fly on standard pressure (pressure altitude, expressed as flight levels), ensuring consistent vertical separation regardless of local barometric variations.
Related Guides#
- Density Altitude Explained
- How to Read a METAR
- How Airplanes Fly — The Complete Aviation Fundamentals Guide