Is water necessarily identical to H2O?

Philosophical Studies 98 (1):99-112 (2000)
Abstract
The “scientific essentialist” doctrine asserts that the following are examples of a posteriori necessary identities: water is H2O; gold is the element with atomic number 79; and heat is the motion of molecules. Evidence in support of this assertion, however, is difficult to find. Both Hilary Putnam and Saul Kripke have argued convincingly for the existence of a posteriori necessities. Furthermore, Kripke has argued for the existence of a posteriori necessary identities in regard to a particular class of statements involving proper names. Neither Kripke nor Putnam, however, has argued convincingly that sentences containing syntactically complex terms or descriptive phrases can express a posteriori necessary identities. I will argue by way of a hypothetical example that ‘water is H2O’ does not express a necessary identity. My argument is unique in that it attacks the relevant sufficiency claim needed to underwrite this putative necessary identity.1 That is, even if we grant that water is necessarily composed of H2O, we should not accept that H2O necessarily forms water.
Keywords Philosophy   Philosophy   Epistemology   Logic   Philosophy of Mind   Philosophy of Religion
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DOI 10.1023/A:1018636505551
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Hane Htut Maung (2016). To What Do Psychiatric Diagnoses Refer? A Two-Dimensional Semantic Analysis of Diagnostic Terms. Studies in History and Philosophy of Science Part C: Studies in History and Philosophy of Biological and Biomedical Sciences 55:1-10.

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