Nnukwu mmanụ nwere ike ịgbanye, ma nnukwu ihe mejupụtara ya na-eme ka ọ bụrụ ihe ịma aka ọkụ ma na-egbochi combustion zuru oke. Agbanyeghị, n'ebe ndị nwere oke ikuku oxygen, mmanụ dị arọ nwere ike ire ọkụ ngwa ngwa.
Mmanụ aṅụ, mgbe ire ọkụ, anaghị agba ọkụ mgbe ya na ire ọkụ na-akpakọrịta ngwa ngwa dịka enwere ike iche. Ọ na-etinye aka na mmeghachi omume oxidation, nke dịtụ nwayọọ na ike.