gas·eous /ˈgæsiəs, ˈgæʃəs/
  (a.)氣體的,氣態的,無實質的
  gas·eous /ˈgæsɪəs, ˈgæʃəs/ 形容詞
  氣(體)的
  Gas·e·ous a.
  1. In the form, or of the nature, of gas, or of an aëriform fluid.
  2. Lacking substance or solidity; tenuous. “Unconnected, gaseous information.”
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  gaseous
       adj : existing as or having characteristics of a gas; "steam is
             water is the gaseous state" [ant: solid, liquid]