Specific Optical Rotatory Power
The "Specific Optical Rotatory Power" Angle of optical rotation divided by the optical path length through the medium and by the mass concentration of the substance giving the specific optical rotatory power.
Applicable units are those of quantitykind:SpecificOpticalRotatoryPower
http://goldbook.iupac.org/O04313.html
The "Specific Optical Rotatory Power" Angle of optical rotation divided by the optical path length through the medium and by the mass concentration of the substance giving the specific optical rotatory power.
$\alpha_m = \alpha \frac{A}{m}$, where $\alpha$ is the angle of optical rotation, and $m$ is the mass of the optically active component in the path of a linearly polarized light beam of cross sectional area $A$.
http://www.iso.org/iso/catalogue_detail?csnumber=31894