"MobilityRatio" describes permeability of a porous material to a given phase divided by the viscosity of that phase.
Applicable units are those of quantitykind:MobilityRatio
"MobilityRatio" describes permeability of a porous material to a given phase divided by the viscosity of that phase.
$b = \frac{\mu_n}{\mu_p}$, where $\mu_n$ and $\mu_p$ are mobilities for electrons and holes, respectively.
http://www.iso.org/iso/catalogue_detail?csnumber=31897