Berry, J J; Davidson, S (2014) Effect of pressure on the sorption correction to stainless steel, platinum/iridium and silicon mass artefacts. Metrologia, 51 (2). S107-S113

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Abstract

This paper reports work undertaken to evaluate the change in mass of platinum/iridium, stainless steel and silicon artefacts measured at atmospheric pressure and in vacuum at a range of pressures typical of those used in vacuum mass comparators and watt balances and for X-ray crystal density measurements. The sets of platinum/iridium, stainless steel and silicon artefacts used in this work have different surface areas and the effect of transferring them between atmospheric pressure and different levels of vacuum was evaluated by measuring the relative changes in mass between them.
Reversible variations in the mass differences between the artefacts were found over the pressure range from 0.1 Pa to atmospheric pressure. At lower pressures (0.001 Pa to 0.1 Pa) the mass differences between all the artefacts were stable and no evidence for hysteresis over this range was found when reducing pressure compared with increasing pressure. Therefore consistent results between watt balance, X-ray crystal density measurements and vacuum mass measurements can be realised providing the measurements are performed within this pressure range.

Item Type:	Article
Keywords:	Mass, vacuum pressure, sorption
Subjects:	Engineering Measurements Engineering Measurements > Mass, Force, Pressure
Identification number/DOI:	10.1088/0026-1394/51/2/S107
Last Modified:	02 Feb 2018 13:13
URI:	http://eprintspublications.npl.co.uk/id/eprint/6166

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