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  2. Pressure altimeter - Wikipedia

    en.wikipedia.org/wiki/Pressure_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. Altimeter - Wikipedia

    en.wikipedia.org/wiki/Altimeter

    Digital barometric pressure sensor for altitude measurement in consumer electronic applications Altitude can be determined based on the measurement of atmospheric pressure. 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 ...

  4. Pitot–static system - Wikipedia

    en.wikipedia.org/wiki/Pitot–static_system

    The pressure altimeter, also known as the barometric altimeter, is used to determine changes in air pressure that occur as the aircraft's altitude changes. [4] Pressure altimeters must be calibrated prior to flight to register the pressure as an altitude above sea level. The instrument case of the altimeter is airtight and has a vent to the ...

  5. Gillham code - Wikipedia

    en.wikipedia.org/wiki/Gillham_Code

    A typical altitude encoder, the ACK Technologies A-30. Note the 15-way D-type connector to send the Gillham code to the transponder and the port on the top of the case that connects to the aircraft's static pressure system. An altitude encoder takes the form of a small metal box containing a pressure sensor and signal conditioning electronics.

  6. Altimeter setting - Wikipedia

    en.wikipedia.org/wiki/Altimeter_setting

    SPS/STD - 'Standard Pressure Setting' or just 'Standard' refers to the altimeter being set to the standard pressure of 1013.25 hPa. It is the setting that causes an altimeter to read the aircraft's flight level (FL). Flight levels are given in hundreds of feet (for example: FL100 = 10 000 ft). Atmospheric pressure changes over time and position.

  7. QFF - Wikipedia

    en.wikipedia.org/wiki/QFF

    QFF is derived from the barometric pressure at the station location by calculating the weight of an imaginary air column, extending from the location to sea level, assuming the temperature and relative humidity at the location are the long term monthly mean, the temperature lapse rate is according to ISA and the relative humidity lapse rate is ...

  8. Why OPEC's grip on oil markets will continue to weaken in 2025

    www.aol.com/why-opecs-grip-oil-markets-193512699...

    OPEC+ faces a major oil oversupply in 2025, challenging production increases. The coalition has tried to boost oil prices by holding back output. Instead, members are ceding control to non-OPEC ...

  9. List of measuring instruments - Wikipedia

    en.wikipedia.org/wiki/List_of_measuring_instruments

    altimeter: altitude ammeter: electric current anemometer: windspeed astrolabe: latitude and altitude of celestial bodies audiometer: hearing barkometer: tanning liquors used in tanning leather barometer: air pressure bettsometer: integrity of fabric coverings on aircraft bevameter: mechanical properties of soil bolometer: electromagnetic ...

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