mˈoʊst əv tɹˌɑːpəsfˈɛɹɪk ɡˈæsᵻz ɑːɹ tɹˈiːɾᵻd æz aɪdˈiəl ɡˈæsᵻz ænd wˈɔːɾɚ vˈeɪpɚ, wɪð ɪts ɐbˈɪləɾi tə tʃˈeɪndʒ fˈeɪz fɹʌm vˈeɪpɚ, tə lˈɪkwɪd, tə sˈɑːlɪd, ænd bˈæk ɪz kənsˈɪdɚd wˈʌn ʌvðə mˈoʊst ɪmpˈoːɹtənt tɹˈeɪs kəmpˈoʊnənts ʌv ˈɛɹ.
Most of tropospheric gases are treated as ideal gases and water vapor, with its ability to change phase from vapor, to liquid, to solid, and back is considered one of the most important trace components of air.