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From a procedures section in a document:

Transfer 1.5 g bovine milk powder into a 200 ml volumetric beaker.

Is it common practice to omit of in construction of the kind

1.5 g (of) bovine milk powder

I have the impression that it is, but I'm not 100% sure. Maybe there's some book describing this condensed style of writing, and this omission of prepositions is mentioned there, but I haven't found a clear mention by googling.

Neither did I find any discussions of this on language-related websites.

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    I have seen it, e.g. "introduce 10mg saline [solution]", so it is probably common usage in highly technical documents. For more general readers, I would use a preposition. – Mick Dec 11 '16 at 12:06
  • @Mick it's also pretty much ubiquitous in cooking recipes. I guess it's just the case of terseness and the ability to quickly skim the text for information being more important than proper grammar. – Maciej Stachowski Dec 11 '16 at 12:23
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    @MaciejStachowski Cooking recipes are highly technical (for me). Don't get me wrong. I can microwave a curry. – Mick Dec 11 '16 at 12:40
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The use of the preposition "of" is definitely grammatically correct; its omission is widely accepted and understood in that context, technical (field of Chemistry) English.

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