2 any process in which a substance reacts with oxygen to produce a significant rise in temperature and the emission of light
3 a chemical process in which two compounds, such as sodium and chlorine, react together to produce heat and light
4 a process in which a compound reacts slowly with oxygen to produce little heat and no light (C15: from Old French, from Latin comburere to burn up, from com- (intensive) + urere to burn)
combustive n, adj
n an enclosed space in which combustion takes place, such as the space above the piston in the cylinder head of an internal-combustion engine or the chambers in a gas turbine or rocket engine in which fuel and oxidant burn
n a heat engine in which the working fluid is heated in an external boiler or heat exchanger and is thus isolated from the process of fuel combustion
heat of combustion
n (Chem) the heat evolved when one mole of a substance is burnt in oxygen at constant volume
n a heat engine in which heat is supplied by burning the fuel in the working fluid (usually air)
n the ignition of a substance or body as a result of internal oxidation processes, without the application of an external source of heat, occurring in finely powdered ores, coal, straw, etc.
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"Collins English Dictionary 5th Edition first published in 2000 © HarperCollins Publishers 1979, 1986, 1991, 1994, 1998, 2000 and Collins A-Z Thesaurus 1st edition first published in 1995 © HarperCollins Publishers 1995"