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  2. Altitude - Wikipedia

    en.wikipedia.org/wiki/Altitude

    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). So when the altimeter reads the country-specific flight level on the standard pressure setting the aircraft is said to be at "Flight level ...

  3. List of mnemonics - Wikipedia

    en.wikipedia.org/wiki/List_of_mnemonics

    Commonly-used coordinating conjunctions in English: FANBOYS [30] [31] F or, A nd, N or, B ut, O r, Y et, S o The verbs in French that use the auxiliary verb être in the compound past (sometimes called " verbs of motion ") can be memorized using the phrase " Dr .

  4. Elevation - Wikipedia

    en.wikipedia.org/wiki/Elevation

    A topographical map is the main type of map used to depict elevation, often through contour lines. In a Geographic Information System (GIS), digital elevation models (DEM) are commonly used to represent the surface (topography) of a place, through a raster (grid) dataset of elevations. Digital terrain models are another way to represent terrain ...

  5. Altimeter - Wikipedia

    en.wikipedia.org/wiki/Altimeter

    Diagram showing the face of the "three-pointer" sensitive aircraft altimeter displaying an altitude of 10,180 ft (3,100 m). Reference pressure of about 29.92 inHg (1013 hPa) is showing in the Kollsman window. An altimeter or an altitude meter is an instrument used to measure the altitude of an object above a fixed level. [1]

  6. Barometric formula - Wikipedia

    en.wikipedia.org/wiki/Barometric_formula

    The values used for M, g 0, and R * are in accordance with the U.S. Standard Atmosphere, 1976, and the value for R * in particular does not agree with standard values for this constant. [2] The reference value for P b for b = 0 is the defined sea level value, P 0 = 101 325 Pa or 29.92126 inHg.

  7. Pressure altitude - Wikipedia

    en.wikipedia.org/wiki/Pressure_altitude

    Old altimeters were typically limited to displaying the altitude when set between 950 mb and 1030 mb. Standard pressure, the baseline used universally, is 1013.25 hectopascals (hPa), which is equivalent to 1013.25 mb or 29.92 inches of mercury (inHg). This setting is equivalent to the atmospheric pressure at mean sea level (MSL) in the ISA

  8. Geopotential height - Wikipedia

    en.wikipedia.org/wiki/Geopotential_height

    Geopotential height differs from geometric height (as given by a tape measure) because Earth's gravity is not constant, varying markedly with altitude and latitude; thus, a 1-m geopotential height difference implies a different vertical distance in physical space: "the unit-mass must be lifted higher at the equator than at the pole, if the same ...

  9. High altitude breathing apparatus - Wikipedia

    en.wikipedia.org/wiki/High_altitude_breathing...

    High-altitude climbing usually requires the use of portable oxygen apparatus when climbing Mount Everest or the other eight-thousanders, though some mountaineers—and alpine style climbers in particular—have deliberately ascended Everest without oxygen (e.g. starting with Reinhold Messner in 1978).