title: The Reduction of Uncertainties for Absolute Piston Gage Pressure Measurements in the Atmospheric Pressure Range.
abstract: NIST pressure calibration services with nitrogen are now based on two transfer standard piston gages for which the effective areas have been determined by calibration with the manometer developed at NIST for gas thermometry. Root-sum-squared three sigma uncertainties for the areas for the two gages are 3.05 ppm and 4.18 ppm.
authors.affiliation: National Institute of Standards and Technology, Gaithersburg, MD 20899.
authors.forename: B E
authors.initials: BE
authors.lastname: Welch
authors.affiliation: National Institute of Standards and Technology, Gaithersburg, MD 20899.
authors.forename: R E
authors.initials: RE
authors.lastname: Edsinger
authors.affiliation: National Institute of Standards and Technology, Gaithersburg, MD 20899.
authors.forename: V E
authors.initials: VE
authors.lastname: Bean
authors.affiliation: National Institute of Standards and Technology, Gaithersburg, MD 20899.
authors.forename: C D
authors.initials: CD
authors.lastname: Ehrlich
keywords: manometer; piston gage; pressure; pressure measurement; pressure metrology; pressure standards