electro-osmotic mobility, u, μeo 

in capillary electromigration
https://doi.org/10.1351/goldbook.ET06923
Electro-osmotic velocity divided by electric field (strength) μeo=νeoE
Source:
PAC, 2004, 76, 443. (Terminology for analytical capillary electromigration techniques (IUPAC Recommendations 2003)) on page 447 [Terms] [Paper]