Arrhenius may refer to

  • Carl Axel Arrhenius (1757–1824), Swedish chemist and discoverer of the element yttrium
  • Niklas Arrhenius, Swedish discus thrower
  • Svante Arrhenius (1859–1927), Swedish physical chemist and 1903 Nobel laureate
    • Arrhenius equation, a formula for modeling the temperature dependence of reaction rate constants.
    • Arrhenius (lunar crater), named for Svante Arrhenius
    • 5697 Arrhenius, main-belt asteroid, named for Svante Arrhenius
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