Ampere

{
  "id": "MLC-T-CHM-000512",
  "term": "Ampere",
  "field": "Chemistry",
  "definition": "The SI base unit of electric current, symbol A, fixed since the 2019 redefinition by giving the elementary charge the exact value 1.602176634 × 10⁻¹⁹ when expressed in coulombs, where one coulomb equals one ampere second. One ampere therefore corresponds to about 6.24 × 10¹⁸ elementary charges passing a point each second. Before 2019 it was defined through the force between two parallel current-carrying conductors.",
  "subject": "Physical and Biophysical Chemistry",
  "see_also": [
    "elementary charge",
    "speed of light in a vacuum"
  ],
  "references": [
    "BIPM, The International System of Units, SI Brochure, 9th ed. (2019), p. 132 (https://www.bipm.org/en/publications/si-brochure/)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/ampere/"
}