They're different units, used to measure different physical quantities. They can't be
directly compared. It would be like deciding whether a day is heavier than a foot.
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A milligram is bigger.
A centigram; 10 times bigger than a milligram.
kilogram
Nano = billionth Milli = thousandth so clearly, a milligram is bigger.
Neither medium nor density is given If fresh water under atmospheric pressure of density 1 gm/cubic cm, then answer is 1000 milligram in a milliliter