## mobility (general)

https://doi.org/10.1351/goldbook.MT06760
Mass transport is described by a @[email protected] $$b$$, defined by: $b_{i} = \frac{\nu _{i}}{\boldsymbol{F}_{i}}$ where $$\nu _{i}$$ is the average @[email protected] velocity and $$\boldsymbol{F}_{i}$$ is the @[email protected] on particle $$i$$.
Source:
PAC, 1999, 71, 1307. (Definitions of Terms for Diffusion in the Solid State) on page 1319 [Terms] [Paper]