Combustion in Rockets

http://perso.orange.fr/jplr/English/rocket/chamber.htm

Next time you pick up anything under pressure- there will be a warning label "Warning Contents under pressure"- there is a possibility for that item to explode. The same with combustion in rockets. If there is to much pressure in a combustion chamber the rocket will explode. This is why NASA has spent so much money and research on not allowing this to happen.
The URL above can explain how a combustion chamber works. Also, visit www.nasa.gov to explore more about rockets.