I can imagine one aspect of flammability (the ability of a substance to ignite on fire) to include calculating the kinetics and thermodynamics of the reaction of the system with oxygen. This is not generalizable though, since in some systems (e.g. alkali metals) there is no need for oxygen in its pure form for the system to catch on fire. What is the "general" way to determine flammability?

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    $\begingroup$ Very interesting question, the rare bookmark for me. $\endgroup$ – Tristan Maxson Oct 26 '20 at 15:13
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    $\begingroup$ While not a full answer at all, I'd like to point out that computational generation of the burning of a specific molecule is an active field of research, a recent review can be found here: sciencedirect.com/science/article/abs/pii/S0360128520300964 . In short, we can generate a reasonable potential energy landscape with combinatorical methods, reduce that mechanism using some advanced tools from the theory of differential equations, solve the so-called master equation on the reduced mechanism, and plug the chemical rate constant into combustion modeling tools to get real properties $\endgroup$ – user430 Apr 26 at 15:25

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