Abstract
Improved knowledge of air density will be useful to support various experiments in the mass field. A study was carried out at the Bureau International des Poids et Mesures to reduce the uncertainty on the air density determination by comparison of the performance of the following three methods: application of the CIPM- 81/91 formula; direct determination using air buoyancy artefacts having the same surface area but a large volume difference; refractometry, exploiting the high correlation between air density and air index of refraction, using a novel refractometer well adapted to our requirements (relative determination). The coherence among the three methods was satisfactory, but a discrepancy of the order of 10/sup -4/ kg/spl middot/m/sup -3/ was observed between the CIPM-81/91 formula and methods employing artefacts. Additional measurements made in the framework of Euromet mass project 144 confirm this difference, which needs to be clarified by future studies using gravimetric measurements and on further investigations of the air composition.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: IEEE Transactions on Instrumentation and Measurement
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
