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) |
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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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