Would it be correct to say "5 billion cubic meters OF natural gas". Is the preposition "of" ever OK after numbers and units of measurement?

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    Yes perfectly idiomatic. There were ten of them present at the meeting. – WS2 Oct 28 '15 at 15:54
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    Hi Irina, Welcome to EL&U. This seems like a very basic question. Although it's fine to ask it here but it might be better if you consider our sister site(ell.stackexchange.com) for such questions in future. That site is targeted for people who have started to learn English and the users there are by default considered as non-native speakers, so the chances of entertaining this question would be more there! – Jony Agarwal Oct 28 '15 at 16:25

Yes - when it is presenting a quantity or portion of a resource: usually volume or mass, but it can also be used with other dimensions, eg half an hour of your time, or an acre of land, or ten yards of that cloth please.

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