▁similar ▁research ▁on ▁phys i ological ▁processes ▁for ▁gener ations ▁to ▁come . ▁ ▁Leg acy ▁ ▁Lav ois ier ' s ▁fundamental ▁contributions ▁to ▁chem istry ▁were ▁a ▁result ▁of ▁a ▁conscious ▁effort ▁to ▁fit ▁all ▁experiments ▁into ▁the ▁framework ▁of ▁a ▁single ▁theory . ▁He ▁established ▁the ▁consistent ▁use ▁of ▁the ▁chemical ▁balance , ▁used ▁o xygen ▁to ▁over throw ▁the ▁ph log ist on ▁theory , ▁and ▁developed ▁a ▁new ▁system ▁of ▁chemical ▁nom en cl ature ▁which ▁held ▁that ▁o xygen ▁was ▁an ▁essential ▁constitu ent ▁of ▁all ▁ac ids ▁( which ▁later ▁turned ▁out ▁to ▁be ▁err one ous ). ▁ ▁Lav ois ier ▁also ▁did ▁early ▁research ▁in ▁physical ▁chem istry ▁and ▁therm od ynam ics ▁in ▁joint ▁experiments ▁with ▁Lap lace . ▁They ▁used ▁a ▁cal or imeter ▁to ▁estimate ▁the ▁heat ▁evol ved ▁per ▁unit ▁of ▁carbon ▁dio x ide ▁produced , ▁eventually ▁finding ▁the ▁same ▁ratio ▁for ▁a ▁fl ame ▁and ▁animals , ▁indicating ▁that ▁animals ▁produced ▁energy ▁by ▁a ▁type ▁of ▁comb ust ion ▁reaction . ▁ ▁Lav ois ier ▁also ▁contributed ▁to ▁early ▁ideas ▁on ▁composition ▁and ▁chemical ▁changes ▁by ▁stating ▁the ▁radical ▁theory , ▁bel ieving ▁that ▁radical s , ▁which ▁function ▁as ▁a ▁single ▁group ▁in ▁a ▁chemical ▁process , ▁combine ▁with ▁o xygen ▁in ▁re actions . ▁He ▁also ▁introduced ▁the ▁possibility ▁of ▁all ot ropy ▁in ▁chemical ▁elements ▁when ▁he ▁discovered ▁that ▁diam ond ▁is ▁a ▁cry st all ine ▁form ▁of ▁carbon . ▁ ▁He ▁was ▁also