_:b670490035 . _:b670490033 . _:b670472745 . _:b670472745 _:b670472748 . . _:b670490035 _:b670490034 . . _:b670472745 . _:b670472746 . _:b670472747 . _:b670472747 . "A fluid front which is composed primarily of gaseous material and separates at least two gaseous masses." . _:b670490037 . "2019-07-22T17:50:08Z"^^ . _:b670472747 _:b670472746 . _:b670490034 . _:b670472745 . _:b670490033 _:b670490036 . _:b670490034 . _:b670490035 . _:b670472749 . _:b670490034 . _:b670490037 . _:b670472748 _:b670472747 . _:b670472746 . _:b670472748 . _:b670490033 . _:b670490037 . _:b670472749 . _:b670472749 . _:b670472749 . _:b670490036 . _:b670490034 . _:b670472748 . _:b670472746 . _:b670490036 . "gaseous front"@en . . _:b670490033 . _:b670490037 . _:b670472746 . _:b670490036 _:b670490035 . _:b670490037 . _:b670472749 . .