drift velocity

in electricity
symbol: $v_{\rm{d}}$
https://doi.org/10.1351/goldbook.08794
Average velocity that a charge carrier attains due to an applied electric field.
Notes:
  1. If an electric field is absent, charge carriers move randomly. An applied electric field induces drift (net movement) of charge carriers in a preferred direction. Average net velocity of this movement is called the drift velocity \(v_{\rm{d}}\).
  2. The drift velocity of a charge carrier is directly proportional to the applied electric field strength \(E\):  \[v_{\rm{d}} = \mu E\]  where constant \(\mu\) is the charge carrier mobility in the given material.
Source:
PAC, 2022, 94, 15. (Glossary of terms relating to electronic, photonic and magnetic properties of polymers (IUPAC Recommendations 2021)) on page 25 [Terms] [Paper]