Index

DEFININGCONSTANTSYMBOL: e

  • PID: si:definingconstantsymbol:e:2019
  • Definition: The elementary charge, e, is exactly 1.602 176 634 × 10-19 C.
  • Source: SI Brochure 9th Ed. 2019, p 127
  • Formatted: 1.602 176 634 x 10-19 C
  • Numerical Value: 1.602176634E-19
  • Unit: C
  • Unit in Base SI: A s
  • Notes
    1. This value was fixed by the CGPM in 2018 (Resolution 1), with effect from 20 May 2019.
    2. The elementary charge corresponds to a coupling strength of the electromagnetic force via the fine-structure constant α = e2 (2c ε0 h), where ε0 is the vacuum electric permittivity or electric constant.
  • Representations
    • Text: e
    • HTML: <em>e</em>
    • Latex: e
  • Related Definitions