if in a combustion chamber, it is required to obtain a temperature of ,say, 800 C. how will you calculate how much fuel (say diesel) is required to be burnt and how much of air is required for the burning, and the air - fuel ratio ?
If the Wikipedia article isn't clear, then it needs editing until it is.
__________________
"Did you get my e-mail?" - "The biggest problem in communication is the illusion that it has taken place" - George Bernard Shaw, 1856