M J T Milton and T J Quinn 2001 Metrologia 38 289 doi:10.1088/0026-1394/38/4/1
M J T Milton and T J Quinn
Show affiliationsPrimary methods of measurement play an important role in metrology because they provide the essential first link in the chain of traceability from the abstract definition of a unit of the International System of Units (SI) to its practical use in measurement. A definition of a primary method of measurement has been developed by the Consultative Committee for Amount of Substance (CCQM) that distinguishes between those methods that measure a quantity directly and those that measure the ratio of two quantities. Methods that do not fulfil the definition of being primary also play an important role in measuring amount of substance. In some cases, it is appropriate to refer to these as secondary methods.
06.30.-k Measurements common to several branches of physics and astronomy
Issue 4 (August 2001)
M J T Milton and T J Quinn 2001 Metrologia 38 289
T J Quinn et al 1997 Metrologia 34 245
Yu V Filatov et al 1997 Metrologia 34 343