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  2. Barometer - Wikipedia

    en.wikipedia.org/wiki/Barometer

    A digital barometer with altimeter setting (for correction) displayed. As the air pressure decreases at altitudes above sea level (and increases below sea level) the uncorrected reading of the barometer will depend on its location. The reading is then adjusted to an equivalent sea-level pressure for purposes of reporting.

  3. Altitude diving - Wikipedia

    en.wikipedia.org/wiki/Altitude_diving

    The lower surface pressure causes larger volume change with the same change in depth relative to the surface compared to sea level conditions. As in the case for sea level diving, the ambient pressure at depth is the atmospheric pressure on the surface of the water plus the hydrostatic pressure due to the weight of the water column above that ...

  4. Altitude - Wikipedia

    en.wikipedia.org/wiki/Altitude

    Aviation altitude is measured using either mean sea level (MSL) or local ground level (above ground level, or AGL) as the reference datum. Pressure altitude divided by 100 feet (30 m) is the flight level, and is used above the transition altitude (18,000 feet (5,500 m) in the US, but may be as low as 3,000 feet (910 m) in other jurisdictions ...

  5. Barometric formula - Wikipedia

    en.wikipedia.org/wiki/Barometric_formula

    The reference value for ρ b for b = 0 is the defined sea level value, ρ 0 = 1.2250 kg/m 3 or 0.0023768908 slug/ft 3. Values of ρ b of b = 1 through b = 6 are obtained from the application of the appropriate member of the pair equations 1 and 2 for the case when h = h b +1 .

  6. Orthometric height - Wikipedia

    en.wikipedia.org/wiki/Orthometric_height

    The orthometric height (symbol H) is the vertical distance along the plumb line from a point of interest to a reference surface known as the geoid, the vertical datum that approximates mean sea level. [1] [2] Orthometric height is one of the scientific formalizations of a layman's "height above sea level", along with other types of heights in ...

  7. List of aviation, avionics, aerospace and aeronautical ...

    en.wikipedia.org/wiki/List_of_aviation,_avionics...

    Alternative Configuration Tool A/F Autofeather: A/FD Airport/Facility Directory: A/P Autopilot: AAE Above aerodrome elevation [1] In aviation, above aerodrome level (AAL), or above aerodrome elevation (AAE), denotes that an altitude is given above the nearest aerodrome or airport. AAIB Air Accidents Investigation Branch: United Kingdom AAIM