[VIM3] 5.4 primary measurement standard

primary standard
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measurement standard established using a primary reference measurement procedure, or created as an artifact, chosen by convention


EXAMPLE 1 Primary measurement standard of amount-of-substance concentration prepared by dissolving a known amount of substance of a chemical component to a known volume of solution.

EXAMPLE 2 Primary measurement standard for pressure based on separate measurements of force and area.

EXAMPLE 3 Primary measurement standard for isotope amount-of-substance ratio measurements, prepared by mixing known amount-of-substances of specified isotopes.

EXAMPLE 4 Triple-point-of-water cell as a primary measurement standard of thermodynamic temperature.

EXAMPLE 5 The international prototype of the kilogram as an artifact, chosen by convention.



2 Measurement