gaseous
adjective chemistry specialized uk/ˈɡeɪ.si.əs/ us/ˈɡæs.i.əs/
含有气体的;像气体的
consisting of gas or gases, or like gas
a gaseous mixture 气体混合物
Steam is water in its gaseous form. 蒸汽是气态水。
Compare: liquid adjectivesolid adjective