They measure different things:
1 milliliter is a measure of volume, whereas
1 milligram is a measure of weight.
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1 mg = 1 milligram 1 Mg = Megagram so the difference is about 10^9
The difference would be that 1 gram = 1000 milligrams, or 1 milligram = 0.001 gram.
1 milligram = 1000 micrograms 1 microgram = 0.001 milligrams
1 milligram = 1,000 micrograms 1 microgram = 0.001 milligram
A liter is more than a milliliter.