Question

define the explosion cumbustion

Answer 1

The transition from combustion to explosion is caused by an acceleration of the reaction, induced either by a rise in temperature or by increasing lengths of the reaction chain. The first is called thermal explosion, and the second is called chain explosion.

Answer 2

An explosion is a very rapid combustion, with a sudden loud noise, that is damaging to internal combustion engines. Ignition of unburned residual mixture is not likely to be the cause of an explosion in an engine cylinder.