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I'm writing a report for school, and I'm wondering if I should say:

the gas form of oxygen

or:

the gaseous form of oxygen

Which one would be the better choice and why?

  • The second: gaseous. You might just say gas in everyday speech but this is a science project? – Weather Vane Jul 1 at 19:40
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Both are grammatical in U.S. English. It is, however, more idiomatic to use an adjective, when one is available, to modify a noun than to use a noun to modify a noun. So I'd use

gaseous oxygen

as a parallel to

solid oxygen.

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    More usual is liquid oxygen. – Weather Vane Jul 1 at 19:45
  • It is, but I was not really thinking of what is commercially available. – Jeff Morrow Jul 1 at 21:35
  • There's even metallic oxygen. Insofar as this question goes, we could point out how that works better than metal oxygen. (Either one might make a good band name, though.) – J.R. Jul 1 at 22:13
  • @JR That's funny. – Jeff Morrow Jul 2 at 4:26

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