Meury, P-A*; Bentouati, D*; Berry, J J; Davidson, S; Plimmer, M*; Silvestri, Z*; Ojanen, M*; Hogstrom, R*; Fuchs, P*; Marti, K*; Zuda, J*; Kacmaz, S*; Green, R* (2015) Summary report of properties of materials for potential use as mass transfer standards. NPL Report. ENG 58

Text ENG58.pdf Download (11MB)

Abstract

The aim of this task is to characterise materials and production techniques for the new generation of mass standards to be used in the watt balance experiments and as primary standards to ensure the dissemination and maintenance of the unit of mass with a target uncertainty of about 10 µg.

Within the scope of the watt balance and Avogadro experiments, which aim at linking the unit of mass to a fundamental constant rather than a material artefact, it is necessary to achieve a direct link between the primary realisations and the reference mass standards that ensure the reliable dissemination of the mass scale. To ensure the mid/short term stability (1 to 10 years) of the new definition and to realise its dissemination with the lowest uncertainties, knowledge of the behaviour (in terms of mass stability) of materials from which mass standards are constructed is essential.

The properties of nine materials were examined to assess their suitability for use as mass standards to disseminate the unit of mass from the new primary realisations.

Item Type:	Report/Guide (NPL Report)
NPL Report No.:	ENG 58
Keywords:	material, mass standards
Subjects:	Engineering Measurements Engineering Measurements > Mass, Force, Pressure
Last Modified:	02 Feb 2018 13:13
URI:	http://eprintspublications.npl.co.uk/id/eprint/6811

Actions (login required)

View Item