Ihe na-eme ka ikuku oxygen bụ ngwaọrụ na-etinye uche na ikuku oxygen site na ikuku gas (nke a na-emekarị ikuku) site n'ịhọpụta na-ewepụ nitrogen iji nye ikuku gas ngwaahịa nwere oxygen.anyị Ihe nchekwa ikuku oxygen nwere ike ịbụ maka ahụike ma ọ bụ eji ụlọ.