Articlebronze2008

Revised formula for the density of moist air (CIPM-2007)

A. Picard · Richard Davis · M. Gläser · Kenichi Fujii

405 citations0/0 files storedMetrologia

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Scientific Measurement and Uncertainty Evaluation Chemical Thermodynamics and Molecular Structure Calibration and Measurement Techniques

Abstract

Measurements of air density determined gravimetrically and by using the CIPM-81/91 formula, an equation of state, have a relative deviation of 6.4 × 10 −5 . This difference is consistent with a new determination of the mole fraction of argon x Ar carried out in 2002 by the Korea Research Institute of Standards and Science (KRISS) and with recently published results from the LNE. The CIPM equation is based on the molar mass of dry air, which is dependent on the contents of the atmospheric gases, including the concentration of argon. We accept the new argon value as definitive and amend the CIPM-81/91 formula accordingly. The KRISS results also provide a test of certain assumptions concerning the mole fractions of oxygen and carbon dioxide in air. An updated value of the molar gas constant R is available and has been incorporated in the CIPM-2007 equation. In making these changes, we have also calculated the uncertainty of the CIPM-2007 equation itself in conformance with the Guide to the Expression of Uncertainty in Measurement , which was not the case for previous versions of this equation. The 96th CIPM meeting has accepted these changes.

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References

2012CODATA recommended values of the fundamental physical constants: 2010 1995Guide to the Expression of Uncertainty in Measurement 2005CODATA recommended values of the fundamental physical constants: 2002 2006Atomic weights of the elements 2005 (IUPAC Technical Report)

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