Engineering Physics Division

The Division provides technical leadership in measurement science research, development, and standards essential to the advanced manufacturing and semiconductor industries. Realizes the SI unit of length and the derived units of acceleration, and acoustic pressure for the U.S.

Of Interest

  • Hall Effect
    The history of the Hall effect begins in 1879 when Edwin H. Hall discovered that a small transverse voltage appeared across a current-carrying thin metal strip in an applied magnetic field. Until that time, electrical measurements provided only the carrier density-mobility product, and the separation of these two important physical quantities had to rely on other difficult measurements. The discovery of the Hall effect enabled a direct measure of the carrier density. The polarity of this transverse Hall voltage proved that it is in fact electrons that are physically moving in an electric current. Development of the technique has since led to a mature and practical tool, which today is used routinely for characterizing the electrical properties and quality of almost all of the semiconductor materials used by industry and in research labs throughout the world.


Acting Division Chief
Office Manager