The differential velocity of charged particles results in a current, while the mass dependence of the drift velocity can result in chemical separation.
2.
In a venturi flow meter, the " differential pressure head " can be used to calculate the " differential velocity head ", which are equivalent in the adjacent picture.
3.
With the band structure ( derived with the Kronig-Penny tight binding approximation ) model, you can attribute this negative differential mobility to a higher-energy, lower curvature band beginning to populate and thereby reduce the net differential velocity with higher field rather than increase it.
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