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A Simple Gravimetric Method to Determine Barometer Corrections.

Randall M Schoonover1

  • 1National Bureau of Standards, Washington, D.C. 20234.

Journal of Research of the National Bureau of Standards (1977)
|September 27, 2021
PubMed
Summary
This summary is machine-generated.

A new gravimetric method calibrates barometers by measuring force differences on a balance with calibrated artifacts. This technique accurately calculates ambient pressure with high precision, offering a reliable calibration alternative.

Keywords:
Air densityair density equationbarometer calibrationbarometric pressuredisplacement volumegravimetric methodmass artifactsweighing

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Area of Science:

  • Metrology
  • Physical Chemistry

Background:

  • Accurate barometer calibration is crucial for various scientific and industrial applications.
  • Existing calibration methods can be complex and require specialized equipment.

Purpose of the Study:

  • To present a novel gravimetric method for calibrating barometers.
  • To determine the precision and reliability of this new calibration technique.

Main Methods:

  • Utilizing a gravimetric approach with two artifacts of similar mass but different volumes.
  • Measuring air temperature and relative humidity during weighing to calculate air density.
  • Deriving a barometer correction based on observed force differences and calculated air density.

Main Results:

  • The gravimetric method allows for the calculation of ambient pressure.
  • Pressure was determined with an uncertainty of 400 ppm (1 S.D.) at one atmosphere.
  • The derived barometer correction showed good agreement with a standard barometer.

Conclusions:

  • The presented gravimetric method offers a precise and potentially simpler alternative for barometer calibration.
  • This technique provides accurate pressure measurements suitable for metrological applications.