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  2. Altimeter - Wikipedia

    en.wikipedia.org/wiki/Altimeter

    The greater the altitude, the lower the pressure. When a barometer is supplied with a nonlinear calibration so as to indicate altitude, the instrument is a type of altimeter called a pressure altimeter or barometric altimeter. A pressure altimeter is the altimeter found in most aircraft, and skydivers use wrist-mounted versions for similar ...

  3. Gillham code - Wikipedia

    en.wikipedia.org/wiki/Gillham_Code

    The transponder gets its altitude information from an encoding altimeter mounted behind the instrument panel that communicates via the Gillham code. Gillham code is a zero-padded 12-bit binary code using a parallel nine- [ 1 ] to eleven-wire interface , [ 2 ] the Gillham interface , that is used to transmit uncorrected barometric altitude ...

  4. Altimeter setting - Wikipedia

    en.wikipedia.org/wiki/Altimeter_setting

    QFE - is the barometric altimeter setting that causes an altimeter to read zero when at the reference datum of a particular airfield (in practice, the reference datum is either an airfield center or a runway threshold). In ISA temperature conditions the altimeter will read the height above the airfield/runway in the vicinity of the airfield.

  5. Altitude - Wikipedia

    en.wikipedia.org/wiki/Altitude

    The exact definition and reference datum varies according to the context (e.g., aviation, geometry, geographical survey, sport, or atmospheric pressure). Although the term altitude is commonly used to mean the height above sea level of a location, in geography the term elevation is often preferred for this usage.

  6. Glossary of physics - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_physics

    A branch of physics that studies atoms as isolated systems of electrons and an atomic nucleus. Compare nuclear physics. atomic structure atomic weight (A) The sum total of protons (or electrons) and neutrons within an atom. audio frequency A periodic vibration whose frequency is in the band audible to the average human, the human hearing range.

  7. What's inside a human ear - AOL

    www.aol.com/news/whats-inside-human-ear...

    Inside our ears is a complex structure that helps us balance, control facial features, and it even plays a major role in our taste. There’s a lot more going on inside your ears than first meets ...

  8. Paul Kollsman - Wikipedia

    en.wikipedia.org/wiki/Paul_Kollsman

    A short time later the Kollsman company received an order from the U.S. Navy for 300 altimeters, their first commercial success. [1] [2] [5] Subsequent models were modified to allow the pilot to easily set a local altimeter setting, shown in the "Kollsman window". [2] [6] [17] By the mid-1930s Kollsman altimeters dominated the aircraft market. [18]

  9. Pressure altitude - Wikipedia

    en.wikipedia.org/wiki/Pressure_altitude

    Aircraft Mode “C” transponders report the pressure altitude to air traffic control; corrections for atmospheric pressure variations are applied by the recipient of the data. The relationship between static pressure and pressure altitude is defined in terms of properties of the ISA.

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