Ụlọ ọrụ ahụike
Gas ọgwụ bụ gas eji eme usoro ahụike. A na-eji ya eme ihe maka ọgwụgwọ, nkụnwụ ahụ, ngwaọrụ ahụike na-anya ụgbọ ala na ngwaọrụ. Gasị ndị a na-ejikarị eme ihe bụ: oxygen, nitrogen, nitrous oxide, argon, helium, carbon dioxide na ikuku mkpakọ.