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milli means 1 thousandth, 1/1000. 1 x 10-3 g

micro means 1 millionth, 1/ 1000000. 1 x 10-6 g

What is meant by a micro milligram? A millionth of a milligram? That is 1 x 10-9 g. A nanogram.

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14y ago

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