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Uncertainty reduction due to correlation effects in weighing during the preparation of primary gas standards

M J T Milton, P T Woods and P E Holland

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SHORT COMMUNICATION

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 fraction of the resulting mixture is not influenced by changes in buoyancy due to the linear expansion of the cylinder. This result will provide a useful simplification to some procedures used in gas metrology


PACS

06.30.Dr Mass and density

06.20.F- Units and standards

Subjects

Instrumentation and measurement

Dates

Issue 1 (February 2002)



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