Amount-of-substance of a component divided by the mass of the system.
Notes:
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The term component is recommended for clinical chemistry, ISO uses "substance".
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The term system is recommended for clinical chemistry, ISO uses mixture.
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Use of the term level as a synonym for content is deprecated.
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In describing a quantity, content must be clearly differentiated from concentration.
Source:
PAC, 1996, 68, 957
(Glossary of terms in quantities and units in Clinical Chemistry (IUPAC-IFCC Recommendations
1996))
on page 994
