Antoine Lavoisier

Record year1777 (read; published in 1780 in the 1777 volume)

summaryA bounded gas-and-combustion functional family: identifying and preparing the specific component of air that sustains combustion, establishing its relation to ordinary air composition and combustion, and using its consumption or combination to give a unified account of combustion, metallic calcination, and weight gain. Priestley and Scheele respectively delivered independent experimental sub-functions, while Lavoisier delivered the anti-phlogiston explanatory sub-function. The three together form one Q, to prevent the same gas-and-combustion chain from receiving full duplicated credit after being split into ‘discovery’ and ‘explanation’.

M rationaleThis object connects combustion-supporting air, increased mass, combustion, and calcination into a testable explanatory chain. It changed the questions chemistry asks about reactants entering products and about metal weight gain, and the related functions of air combination and mass balance continue to enter foundational chemistry. Its coverage is broader than Faraday’s M5.3 quantitative laws and terminology of electrochemical decomposition. Like the M6.5 foundational frameworks of Rutherford’s large-angle scattering–concentrated-charge inference and Clausius’s second law–entropy formalization, it reorganizes inquiry across phenomena; the central 6.6 is a provisional judgment of coverage, foundationality, and persistence, not a mechanical addition of 0.1 for ‘two types of process’ or for the number of phenomena. It remains below the M7 cross-domain frameworks of natural selection, information theory, and electromagnetic-field/light synthesis: the 1777 text retains a fire-matter hypothesis and the erroneous universal-acidity claim, and this candidate excludes the whole history of mass conservation, nomenclature, element definition, water composition, and modern oxidation–reduction. 6.4 and 6.8 are scope-sensitivity points, not historical confidence intervals.

attribution rationaleThe central allocation does not follow a discoverer’s fame, publication order, or later eponymy. Lavoisier directly delivered this object’s unified explanation and therefore receives the largest single share, 0.44. Priestley’s gas preparation, observation of strong combustion support, and documented communication in Paris form an identifiable experimental-and-transmission sub-function, receiving 0.16. Scheele independently delivered sub-functions of preparation, air’s two components, and their relation to combustion, receiving 0.14. Scheele’s share represents independent joint formation within the same bounded functional family; it does not claim that Lavoisier consumed Scheele’s text. It is below Priestley’s because there is no direct evidence of transmission and Scheele’s explanation remained phlogistic. The 0.18 prehistory share prevents the terminal account from appearing without background; 0.08 reserves laboratory collaboration and the unknown. 44/16/14 are reasoned provisional point estimates, not proportions supplied directly by sources.

overlap boundaryPriestley’s and Scheele’s gas preparation, combustion support, and air composition, together with Lavoisier’s combustion-and-calcination explanation, constitute one bounded gas-and-combustion functional family and generate only one Q. This is a deduplication choice; it does not claim that Lavoisier actually consumed every experiment. If a later oxygen-experiment identification outcome is created, its corresponding preparation/property sub-functions must first be removed from this item and the budget recalculated; ‘oxygen discovery’ cannot receive full credit while this item remains unchanged. Mass conservation, respiration, water composition, nomenclature, and teaching materials may receive only isolable new functions.

Evidence gapsLavoisier’s laboratory members, instrument making, and measurement chain have not yet been itemized into actions; direct transmission from Scheele to Lavoisier is unproven; Priestley’s communication is an author’s self-report that is specifically locatable but not an independent meeting record; and the 1777 text is only one public node in the theory’s development. The preceding gaps are carried by the prehistory pool and the 0.08 unresolved share; they are not permanent grounds for refusing to score.