Question

What are reference standards?

Answer 1

Answer:

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Explanation:

Reference Standards. A reference standard is a substance prepared for use as the standard in an assay, identification, or purity test and should have a quality appropriate for its use.

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Answer 2

Answer:

A reference standard for a unit of measurement is an artifact that embodies the quantity of interest in a way that ties its value to the reference base. At the highest level, a primary reference standard is assigned a value by direct comparison with the reference base. Mass is the only unit of measurement that is defined by an artifact.

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