Chemistry
- January 1 – William Henry's formulation of his law on the solubility of gases first published.
- October 21 – John Dalton's atomic theory and list of molecular weights first made known, at a lecture in Manchester.
- William Hyde Wollaston discovers the chemical element rhodium.
- Smithson Tennant discovers the chemical elements iridium and osmium.
- Cerium is discovered in Bastnäs (Sweden) by Jöns Jakob Berzelius and Wilhelm Hisinger, and independently in Germany by Martin Heinrich Klaproth.
- Claude Louis Berthollet publishes Essai de statique chimique in Paris.
Read more about this topic: 1803 In Science
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—Ellen Henrietta Swallow Richards (1842–1911)