To convert liters to milligrams, you need to know the density of the substance in question. If we assume water, which has a density of 1 gram per milliliter, then 1 liter of water is equal to 1,000 grams or 1,000,000 milligrams. Therefore, 3 liters would be equal to 3,000,000 milligrams.
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3000 mg water = 3g water = 0.003 kg water
Water Density is ----> 1000 kg/m3
One litre is equal to 1/1,000 cubic metre
1000 kg/m3 * 1/1000 m3 = 1 kg in 1/1000 cubic meter
Therefore if 1 kg is 1 liter, 0.003 kg is 0.003 liter.
"0.003 liters"
A milligram is a unit of mass. A litre is a unit of capacity. Without some unit of density to compare, the two units are incompatible.