Proofread the following text carefully, correcting any errors in spelling. withinasmallchamber,(typicallypetro lordiesil)andair. onceignited,,,.,,.

Within a small chamber, an internal combustion engine combines a precisely measured mix of fuel (typically petrol or diesel) and air. Once ignited, this explosive combination causes an expansion of hot, pressurized gases to exit the chamber, typically via pistons or a turbine. Thus the chemical energy is converted, albeit often not very efficiently, into mechanical energy which can then be used to power motors and drive machines.  

answer: this is easy, i found "it"

i will repeat the question again, "find it."

here, i located it.