Berry, J J; Borys, M*; Mecke, M*; Silvestri, Z* (2015) Report on the evaluation of medium-term (6-month) storage in nitrogen compared with storage in air (EMRP SIB-05 Work Package 4 Deliverable 4.3.3). NPL Report. ENG 60

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Abstract

The aim of this task was to compare the effect of storing mass artefacts for a 6-month period in nitrogen with artefacts stored conventionally in air. The current definition of the kilogram is a cylinder of platinum-iridium alloy 39 mm in diameter and 39 mm high which is stored under a triple bell jar in air [1]. As a future fundamental constant definition of the kilogram will be realised in a vacuum [2], [3] improved stability of the mass artefacts used to provide traceability to the new definition may be possible if the artefacts are stored in a pure gas such as nitrogen between measurements instead of storage in air

Item Type:	Report/Guide (NPL Report)
NPL Report No.:	ENG 60
Keywords:	mass, storage, vacuum, inert gas
Subjects:	Engineering Measurements Engineering Measurements > Mass, Force, Pressure
Last Modified:	02 Feb 2018 13:13
URI:	http://eprintspublications.npl.co.uk/id/eprint/6832

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