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Lavoisier used balances, sealed apparatus, and gas accounting to show that calcination and combustion involved uptake from air rather than loss of a hypothetical material principle.
Balance methods and conservation reasoning predated Lavoisier. His causal contribution was a sustained quantitative oxygen-based reconstruction of combustion and chemical accounting, not one isolated proof of a timeless law.
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Lavoisier’s balance and gas-accounting program made conservation-based bookkeeping operational in the new oxygen chemistry; it did not create the abstract conservation idea from nothing.
The source experiment, observation, anomaly, or problem materially motivated the development, revision, or acceptance of the target concept. Historical influence is not logical derivation; the edge detail states the documented role and avoids retrospective origin myths.
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