"Specific Volume" ($\nu$) is the volume occupied by a unit of mass of a material. It is equal to the inverse of density.
Applicable units are those of quantitykind:SpecificVolume
http://en.wikipedia.org/wiki/Specific_volume
https://cdd.iec.ch/cdd/iec61987/iec61987.nsf/ListsOfUnitsAllVersions/0112-2---62720%23UAD175
$sv = \frac{1}{\rho}$, where $\rho$ is mass density.
http://www.iso.org/iso/catalogue_detail?csnumber=31889