A measure of the extent to which something is flammable(noun)
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Use "flammability" in a sentence
"For this, one must take a look at stuff like the toxicity and flammability of materials apart from their nature of wear and tear and how they interact with different climate conditions."
"This legislation calls for an alternative flammability standard that can be met without the use of chemical fire retardants, and that does not compromise fire safety."
"A common sense solution to this is to change the California flammability standard so that fire safety can be preserved without compromising public health."