Davidson, S (2012) Characterisation of the long-term stability of mass standards stored in vacuum by weighing and surface analysis. Metrologia, 49 (3). pp. 200-208.

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Abstract

This paper reports work undertaken to investigate the stability of primary platinum-iridium mass standards stored in vacuum. Mass standards manufactured from platinum-iridium and stainless steel were stored in vacuum over periods of 42 months (platinum-iridium) and 18 months (stainless steel) and the stability of the standards compared with that of similar masses stored in air. Additionally, X-ray photoelectron spectroscopy was used to study the surfaces of coupons stored alongside the mass standards in order to characterise changes in the contamination overlayer on the weights and correlate this with the measured changes in the mass of the standards.

Item Type:	Article
Keywords:	Kilogram, mass, standards, redefinition, watt balance, Avogadro, weighing, vacuum, mise-en-pratique
Subjects:	Engineering Measurements Engineering Measurements > Mass, Force, Pressure
Identification number/DOI:	10.1088/0026-1394/49/3/200
Last Modified:	02 Feb 2018 13:14
URI:	http://eprintspublications.npl.co.uk/id/eprint/5415

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