▁responsible ▁for ▁the ▁construction ▁of ▁the ▁gas ometer , ▁an ▁expensive ▁instrument ▁he ▁used ▁at ▁his ▁demonstr ations . ▁While ▁he ▁used ▁his ▁gas ometer ▁exclus ively ▁for ▁these , ▁he ▁also ▁created ▁smaller , ▁che aper , ▁more ▁practical ▁gas om eters ▁that ▁worked ▁with ▁a ▁sufficient ▁degree ▁of ▁precision ▁that ▁more ▁chem ists ▁could ▁re create . ▁ ▁He ▁was ▁essentially ▁a ▁the or ist , ▁and ▁his ▁great ▁mer it ▁lay ▁in ▁his ▁capacity ▁to ▁take ▁over ▁experimental ▁work ▁that ▁others ▁had ▁carried ▁out — without ▁always ▁ade qu ately ▁recogn izing ▁their ▁claims — and ▁by ▁a ▁rig orous ▁logical ▁procedure , ▁rein for ced ▁by ▁his ▁own ▁quant itative ▁experiments , ▁exp ounding ▁the ▁true ▁explanation ▁of ▁the ▁results . ▁He ▁completed ▁the ▁work ▁of ▁Black , ▁Pri est ley ▁and ▁Cav end ish , ▁and ▁gave ▁a ▁correct ▁explanation ▁of ▁their ▁experiments . ▁ ▁Over all , ▁his ▁contributions ▁are ▁considered ▁the ▁most ▁important ▁in ▁adv ancing ▁chem istry ▁to ▁the ▁level ▁reached ▁in ▁physics ▁and ▁mathematics ▁during ▁the ▁ 1 8 th ▁century . ▁ ▁Awards ▁and ▁hon ours ▁During ▁his ▁lifetime , ▁Lav ois ier ▁was ▁awarded ▁a ▁gold ▁medal ▁by ▁the ▁King ▁of ▁France ▁for ▁his ▁work ▁on ▁urban ▁street ▁light ing ▁( 1 7 6 6 ), ▁and ▁was ▁appointed ▁to ▁the ▁French ▁Academy ▁of ▁Sciences ▁( 1 7 6 8 ). ▁ ▁Lav ois ier ' s ▁work ▁was ▁recognized ▁as ▁an ▁International ▁Historic ▁Chem ical ▁Land mark ▁by ▁the ▁American ▁Chem