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1802 in science
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==Physics== * [[Johann Wilhelm Ritter]] builds the first [[electrochemical cell]].<ref>{{cite journal|first=Hermann |last=Berg |year=2008 |title=Johann Wilhelm Ritter: the Founder of Scientific Electrochemistry |journal=Review of Polarography |volume=54 |number=2 |pages=99β103 |doi=10.5189/revpolarography.54.99 |doi-access=free }}</ref><ref>{{cite book|first=Walter D.|last=Wetzels|year=1978|chapter=J. W. Ritter: the Beginnings of Electrochemistry in Germany|title=Selected Topics in the History of Electrochemistry|editor-last1=Dubpernell|editor-first1=G.|editor-last2=Westbrook|editor-first2=J. H.|location=Princeton|publisher=Electrochemical Society|pages=68β73}}</ref>
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