None.
A millilitre is a measure of volume whereas a milligram is a measure of mass. The two measure different things and there is no point in even thinking about converting from one to the other. A moment's thought should be sufficient to convinve you that a millilitre of air will have much less mass than a millilitre of lead. So there is no conversion between millilitre and milligram that would apply to air as well as to lead.
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There is no direct conversion between milliliters (volume) and milligrams (mass) as they are two different units used to measure different properties. The conversion would depend on the density of the substance being measured.
4.25 micrograms is equal to 0.00425 milligrams.
A gram is equal to 1,000 milligrams. So, 376 grams equals 376,000 milligrams.
There are 1000 milligrams in a gram.
65,000 milligrams is equal to 65 grams, and 65 grams is equal to 0.065 kilograms. Therefore, 65,000 milligrams is equal to 0.065 kilograms.
There are 1000000 milligrams in a kilogram. This means 0.025kgx1,000,000 is 25,000 milligrams.