- published: 15 Oct 2015
- views: 18413983
Combustion /kəmˈbʌs.tʃən/ or burning is a high-temperature exothermic redox chemical reaction between a fuel and an oxidant, usually atmospheric oxygen, that produces oxidized, often gaseous products, in a mixture termed as smoke. Combustion in a fire produces a flame, and the heat produced can make combustion self-sustaining. Combustion is often a complicated sequence of elementary radical reactions. Solid fuels, such as wood, first undergo endothermic pyrolysis to produce gaseous fuels whose combustion then supplies the heat required to produce more of them. Combustion is often hot enough that light in the form of either glowing or a flame is produced. A simple example can be seen in the combustion of hydrogen and oxygen into water vapor, a reaction commonly used to fuel rocket engines. This reaction releases 242 kJ/mol of heat and reduces the enthalpy accordingly (at constant temperature and pressure):
Combustion of an organic fuel in air is always exothermic because the double bond in O2 is much weaker than other double bonds or pairs of single bonds, and therefore the formation of the stronger bonds in the combustion products CO2 and H2O results in the release of energy. The bond energies in the fuel play only a minor role, since they are similar to those in the combustion products; e.g., the sum of the bond energies of CH4 is nearly the same as that of CO2. The heat of combustion is approximately -418 kJ per mole of O2 used up in the combustion reaction, and can be estimated from the elemental composition of the fuel.
[sample1]:
Gentlemen, may I have your attention please?
[sample2]:
There's stuff coming back at you all the time!
[sample3]:
You have to do it and do it together, do it and do it together
(sample2)
(sample3)
Burning, burning
Destiny comes knocking on your door
Takes you were the money meets the floor
Jealousy comes creeping up on you
And make you do those things that you hate to do
[chorus 1]:
Yes I'm burning
She won't get away
(Burning) 'cause I'm here to say
She's coming back
And it's a fact
She's here to stay
Everybody wants a piece of you
And charity begins at the age of two
So baby, baby, baby, shut your door
'Cause I won't leave you on this killing floor
[chorus 2]:
'Cause I'm burning
She won't get away
(Burning) 'cause I'm here to say
She's coming back
And it's a fact
She's here to stay
[sample 4]
Hello. Yes, you're on the air
[sample 5]
Hello?
[lots of jumbled repetitions of parts of samples 4 and 5]
Burning, Burning
Burning, Burning