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SESK: Stuff Everyone Should Know · sesk.info/aero-altimeter-pressure

Which measurement lets an altimeter estimate altitude?

It senses static air pressure.

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  1. Static air pressure ✔
  2. Fuel temperature
  3. Magnetic heading

Why: Atmospheric pressure normally decreases as altitude increases. An altimeter compares sensed pressure with its setting and displays an altitude.

Huh, didn't know that: Pilots update the altimeter setting when local pressure changes.

The dad joke
The altimeter rose through the ranks one foot at a time.
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References

Answer: Static air pressure. Atmospheric pressure normally decreases as altitude increases. An altimeter compares sensed pressure with its setting and displays an altitude.

  1. Aerospace Dimensions Module 2: Aircraft Systems and Airports akwg.cap.gov/media/cms/Module_2__Aircraft_Systems_and_Airp_1A4CD2C6AF085_eae81.pdf
    That is how altimeters work. Just before take-off, a pilot sets the altimeter to the local pressure.
    Checked 2026-10-10.

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