Normal barometer

{
  "id": "MLC-T-MET-007591",
  "term": "Normal barometer",
  "field": "Meteorology and atmospheric science",
  "definition": "A mercury barometer of a specific design and high precision, intended for use as a reference standard to calibrate other barometers. Its construction requires pure, degassed mercury and a precisely measured glass tube, with corrections applied for temperature, gravity, and capillary action to yield an accurate pressure reading. The Fortin barometer is a well-known type of transportable normal barometer used for station and laboratory calibration.",
  "url": "https://mlchart.com/terminology/meteorology/normal-barometer/"
}