Flammable vapour suppression

Allied to flammability is smoke density suppression especially in confined spaces, e.g., airliners, houses, warehouses. Many aromatic compounds bum with a smoky flame (e.g., styrene), whereas corresponding aliphatic compounds tend to burn with a clean "transparent" flame. This is because air-bome poly-aromatic vapours decompose to give volatile carbon (smoke) in low oxygen environments. 

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