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1884 in science
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==Chemistry== * October 14 – [[George Eastman]] is granted his first [[patent]]s for photographic [[roll film]] in the United States. * [[Jacobus Henricus van 't Hoff|J. H. van 't Hoff]] proposes the [[Arrhenius equation]] for the temperature dependence of the [[reaction rate constant]], and therefore, rate of a chemical reaction.<ref>[https://goldbook.iupac.org/terms/view/A00446 Arrhenius equation] – IUPAC Goldbook definition</ref> * [[Hermann Emil Fischer]] proposes the structure of [[purine]], a key component in many biomolecules, which he synthesizes in 1898; he also begins work on the chemistry of [[glucose]] and related [[sugar]]s.<ref>{{cite web|title= Emil Fischer: The Nobel Prize in Chemistry 1902|work=Nobel Lectures, Chemistry 1901–1921|publisher=Elsevier Publishing Company|year=1966|url= http://nobelprize.org/nobel_prizes/chemistry/laureates/1902/fischer-bio.html|accessdate= 2007-02-28}}</ref> * [[Henry Louis Le Chatelier]] develops [[Le Chatelier's principle]], which explains the response of dynamic [[chemical equilibrium|chemical equilibria]] to external stresses.<ref>{{cite book|title=Henry Louis Le Châtelier|series=World of Scientific Discovery|publisher=Thomson Gale|year=2005|url=http://www.bookrags.com/biography/henry-louis-le-chatelier-wsd/|accessdate=2007-03-24}}</ref> * [[Paul Vieille]] invents [[Poudre B]], the first [[smokeless powder]] for firearms.<ref>{{cite book|last=Davis|first=Tenney L.|title=The Chemistry of Powder and Explosives|year=1943|pages=289–292|location=New York|publisher=Wiley}}</ref>
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