In aircraft, an aneroid barometer measures the atmospheric pressure from a static port outside the aircraft.
Air pressure decreases with an increase of altitude—approximately 100 hectopascals per 800 meters or one inch of mercury per 1000 feet near sea level.
The analogic altimeter has 2 needles:
- The longest one for the hundreds of feet
- The shortest one for the thousands of feet
The pressure chosen can be local airfield pressure QNH or standard QNH 1013 hPa / 29,92 inHg dependent on your altitude and country regulation.
Refer to the altimeter setting methodology page for more information
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DATE OF SUBMISSION
- 02:14, 14 May 2021
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