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?
closed as off-topic by Marv Mills, DJClayworth, tchrist♦, choster, FumbleFingers Oct 29 '15 at 16:24
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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.