Editing 1803 in science (section)

==Chemistry==
* January 1 – [[William Henry (chemist)|William Henry]]'s formulation of [[Henry's law|his law on the solubility of gases]] first published.<ref>{{cite journal|first=William|last=Henry|title=Experiments on the Quantity of Gases Absorbed by Water, at Different Temperatures, and under Different Pressures|journal=[[Philosophical Transactions of the Royal Society]]|location=London|date=January 1, 1803|volume=93|pages=29–274|doi=10.1098/rstl.1803.0004|title-link=:File:William Henry-Experiments on the Quantity of Gases Absorbed by Water.pdf|doi-access=free}}</ref>
* September 3 – English scientist [[John Dalton]] starts using symbols to represent the atoms of different [[chemical elements]].
* October 21 – [[John Dalton]]'s [[atomic theory]] and list of [[molecular weight]]s first made known, at a lecture in [[Manchester]].<ref>{{cite journal|first=John|last=Dalton|title=On the Absorption of Gases by Water and Other Liquids|url=http://web.lemoyne.edu/~giunta/dalton52.html|journal=Memoirs of the Literary and Philosophical Society of Manchester |series=2nd Series|volume=1|year=1805|pages=271–87| accessdate=April 27, 2011 <!--Added by DASHBot-->| archiveurl= https://web.archive.org/web/20110611205519/http://web.lemoyne.edu/~giunta/dalton52.html| archivedate= June 11, 2011 <!--Added by DASHBot-->}}</ref><ref>{{cite journal|url=http://www.rsc.org/delivery/_ArticleLinking/DisplayArticleForFree.cfm?doi=b307622a&JournalCode=DT|title=John Dalton, the man and his legacy: the bicentenary of his Atomic Theory|year=2003 |doi=10.1039/B307622A |accessdate=February 17, 2008|last1=Lappert |first1=Michael F. |last2=Murrell |first2=John N. |journal=Dalton Transactions |issue=20 |pages=3811–3820 |url-access=subscription }}</ref>
* [[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]].<ref>{{cite web|url= http://www.rsc.org/chemsoc/visualelements/pages/data/cerium_data.html|work=Visual Elements|title=Cerium|year=1999–2005|publisher=[[Royal Society of Chemistry]]|location=London|accessdate=November 21, 2011}}</ref>
* [[Claude Louis Berthollet]] publishes ''[https://archive.org/details/essaidestatiquec01bert Essai de statique chimique]'' in Paris.