Milton, M J T; Woods, P T; Holland, P E (2002) Uncertainty reduction due to correlation effects in weighing during the preparation of primary gas standards. Metrologia, 39. pp. 97-99.

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Abstract

The accurate weighing of gas into high-pressure cylinders plays a central role in providing traceability for primary gas mixtures. The uncertainties in the masses of successive components added to such mixtures are significantly correlated. We show that a consequence is that the amount of fraction of the resulting mixture is not influenced by changes in buoyancy due to linear expansion of the cylinder. This result will provide a useful simplification to some procedures used in gas metrology.

Item Type:	Article
Subjects:	Analytical Science
Last Modified:	02 Feb 2018 13:17
URI:	https://eprintspublications.npl.co.uk/id/eprint/2397