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Aneroid barometer

 Aneroid barometer

  • To provide a common reference, the International Standard Atmosphere (ISA) has been established.
  •  These standard conditions are the basis for certain flight instruments(pipe instrument) and most aircraft performance data.
  • Standard sea level pressure is defined as 29.92 "Hg and a standard temperature of 59 °F (15 °C).
  • Atmospheric pressure is also reported in millibars (mb), with 1 "Hg equal to approximately 34 mb.
  •  Standard sea-level pressure (sprint trial)is 1,013.2 mb.
  • ical mb pressure readings range from 950.0 to 1,040.0 mb. Constant pressure charts and hurricane pressure reports are written using mb.
  • Since weather stations are located around the globe, all local barometric pressure readings are converted to a sea-level pressure to provide a standard (standard times)for records and reports.
  •  To achieve this, each station converts its barometric pressure by adding approximately 1 "Hg for every 1,000 feet of elevation.
  • For example, a station(station near me) at 5,000 feet above sea level, with a reading of 24.92 "Hg, reports a sea-level pressure reading of 29.92 "Hg.
  • Using common sea-level pressure readings help ensure aircraft altimeters are set correctly, based on the current pressure readings. By tracking barometric pressure trends across.
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