Flammable means that it can react with oxygen (that is what burning is – reacting with oxygen). Hydrogen is extremely flammable, and will burn with oxygen to form H2O (two hydrogens with one oxygen – otherwise known as water). According to this article, the most flammable chemical looks to be chlorine trifluoride, ClF3. https://www.thoughtco.com/most-flammable-chemical-607315
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