Editing 1805 in science (section)

==Chemistry==
* [[John Dalton]]'s list of [[molecular weight]]s is first published.<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}}</ref>
* [[Joseph Louis Gay-Lussac]] discovers that water is composed of two parts hydrogen and one part oxygen by volume.<ref name="Profile">{{cite web|title=Joseph Louis Gay-Lussac|url=https://www.sciencehistory.org/historical-profile/joseph-louis-gay-lussac|website=Science History Institute |accessdate=21 March 2018|date=June 2016}}</ref><ref name=Bowden>{{cite book|last1=Bowden|first1=Mary Ellen|title=Chemical achievers : the human face of the chemical sciences|chapter-url=https://archive.org/details/chemicalachiever0000bowd|chapter-url-access=registration|date=1997|publisher=Chemical Heritage Foundation|location=Philadelphia, PA|isbn=9780941901123|chapter=Joseph Louis Gay-Lussac|pages=[https://archive.org/details/chemicalachiever0000bowd/page/13 13–15,53]|url=https://archive.org/details/chemicalachiever0000bowd/page/13}}</ref>
* [[Jane Marcet]]'s elementary textbook for young people, ''Conversations on Chemistry'' ("intended more especially for the female sex"), is published anonymously in London. It proves extremely popular on both sides of the Atlantic, running through at least forty editions.<ref>{{cite web|title=Jane Marcet|url=https://www.sciencehistory.org/historical-profile/jane-marcet|website=Science History Institute|accessdate=21 March 2018|date=June 2016}}</ref><ref>{{cite ODNB|first=Elizabeth J.|last=Morse|title=Marcet, Jane Haldimand (1769–1858)|year=2004|edition=Online|url=http://www.oxforddnb.com/view/article/18029|accessdate=2013-10-14|doi=10.1093/ref:odnb/18029}} </ref>