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History of Kilogram 18 and other important UK reference mass.

Lewis, S L; Havard, D C (1996) History of Kilogram 18 and other important UK reference mass. NPL Report. MOT 1

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Abstract

This report describes the history of and records the mass values assigned to the UK National Copy (No 18) of the International Prototype Kilogram and the other important mass standards which form the basis of the UK mass scale. Particular attention is paid to their mass stability, especially the effects of washing and cleaning Kg 18. Also included are details of their storage conditions and descriptions of the weighing equipment, weighing techniques and data analysis methods which have been used by the National Physical Laboratory (NPL) for the intercomparison and calibration of these standards in recent years. The evidence and the data upon which corrections have been applied to the mass value of Kg 18 to allow for mass regain after washing and cleaning are discussed, as are possible changes to its treatment in the future based on recent findings concerning Pt-Ir surfaces and their contamination.

Item Type: Report/Guide (NPL Report)
NPL Report No.: MOT 1
Subjects: Engineering Measurements
Engineering Measurements > Mass, Force, Pressure
Last Modified: 02 Feb 2018 13:18
URI: http://eprintspublications.npl.co.uk/id/eprint/391

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