catalytic activity concentration, $$b$$

https://doi.org/10.1351/goldbook.C00882
Catalytic activity of the component divided by the volume of the system.
Notes:
1. In clinical chemistry @[email protected] is recommended as unit for the volume.
2. In clinical chemistry the component is usually an enzyme.
3. The term @[email protected] is accepted for use in clinical chemistry.
4. Use of the term level as a synonym for concentration is deprecated.
5. In describing a quantity, @[email protected] must be clearly differentiated from @[email protected]
Source:
PAC, 1996, 68, 957. (Glossary of terms in quantities and units in Clinical Chemistry (IUPAC-IFCC Recommendations 1996)) on page 964 [Terms] [Paper]