Combustion
complex, rapid chemical transformation accompanied by the release of a significant amount of heat and bright luminescence
Source: "Safety Rules and Order for Eliminating Emergency Situations Involving Dangerous Goods During Their Transportation by Rail" (approved by the Ministry of Emergency Situations of Russia on 31.10.1996 No. 9/733/3-2, by the Ministry of Railways of Russia on 25.11.1996 No. ЦМ-407)
Combustion: an exothermic oxidation reaction of a substance accompanied by at least one of three factors: flame, luminescence, or emission of smoke
Source: "GOST R 53280.2-2010. National Standard of the Russian Federation. Automatic Fire Extinguishing Systems. Fire Suppressing Agents. Part 2. Foam Concentrates for Subsurface Fire Fighting of Oil and Petroleum Products in Tanks. General Technical Requirements and Test Methods"
(approved by the Order of Rosstandart on 29.04.2010 No. 68-ст)