Cua Cais
Huab cua ua kom sib cais cog cais cov huab cua nkag mus rau hauv nws cov khoom siv, feem ntau yog nitrogen thiab oxygen, thiab qee zaum tseem muaj argon thiab lwm yam khoom siv roj tsawg. Txoj kev nquag siv rau kev sib cais huab cua yog fractional distillation.