Charge-to-Size Ratio
This ratio (q/m) is a fundamental determinant of electrophoretic mobility, where q is the charge and m is the mass of the analyte molecule.
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The statement of the theorem
Define the charge-to-size ratio for an analyte molecule as the ratio of its net charge (in Coulombs) to its effective mass (in kilograms): \n \nThis ratio is the primary determinant of the electrophoretic mobility in a given medium.
Source: Wikipedia