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gaseous + noun
gaseous 作定语时置于名词前，表示“气态的”。
Gaseous pollutants can harm human health.
气态污染物会危害人体健康。
气体的；气态的
先理解核心含义，再看它在真实句子里的用法。
气体的；气态的
existing as or having characteristics of a gas
Gaseous pollutants can harm human health.
气态污染物会危害人体健康。
与气体有关的；以气体状态存在的。
Relating to, or existing as gas (matter in an intermediate state between liquid and plasma).
含气泡的；有气的。
Of a liquid containing bubbles: gassy.
缺乏实质或坚实性的；微弱的。
Lacking substance or solidity; tenuous.
At room temperature, this chemical is gaseous.
在室温下，这种化学物质是气态的。
When heated, water changes from a liquid to a gaseous state.
加热时，水从液态变为气态。
The factory must filter its gaseous waste before releasing it.
工厂在排放前必须过滤其气态废物。
gaseous 作定语时置于名词前，表示“气态的”。
Gaseous pollutants can harm human health.
气态污染物会危害人体健康。
gaseous 可在系动词 be 后作表语，说明主语所处的物理状态。
The substance is gaseous at room temperature.
该物质在室温下是气态的。
become 后接 gaseous 表示状态变化，从液态等变成气态。
When heated, the liquid becomes gaseous.
加热时，这种液体变成气态。
Not this
The substance is gas at room temperature.
Use this
The substance is gaseous at room temperature.
gas 是名词，不能单独作表语；描述某物处于气态时，应用形容词 gaseous。
Not this
I feel gaseous after eating beans.
Use this
I feel gassy after eating beans.
gaseous 意为“气态的”，指物质的存在状态；表示“肠胃胀气的”应用 gassy，两者不可混用。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
气态
Water changes from a liquid to a gaseous state when it boils.
水沸腾时从液态变为气态。
气体排放物
The factory has installed filters to reduce its gaseous emissions.
该工厂已安装过滤器以减少气体排放物。
气体交换
Gaseous exchange occurs in the lungs during breathing.
呼吸时，肺部发生气体交换。
气体混合物
The air we breathe is a gaseous mixture of nitrogen and oxygen.
我们呼吸的空气是氮气和氧气的气体混合物。
气态行星
Jupiter and Saturn are known as the gaseous planets.
木星和土星被称为气态行星。
Use gaseous naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
gaseous 开头是 gas（气体），把它想成气体的小分子到处乱跑，就是‘气体的’。
语域：formal 常见场景：scientific writing、technical descriptions gaseous 表示“气体的、气态的”，多用于科技或正式语境；日常口语中更常说 gas 或“气体状态”。
No common English word fully rhymes with gaseous /ˈɡæsiəs/. The listed -eous words are spelling lookalikes, not true rhymes: hideous and courteous keep the /iəs/ ending but have a different stressed vowel, while gorgeous, outrageous, courageous, and righteous sound like /dʒəs/ or /tʃəs/.
Dictionary facts from ECDICT, WIKTIONARY.