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A milligram is a unit of weight, it is one-thousandth of one gram. Milliliters are units of volume. each milliliter is one-thousandth of one liter (or 1 cubic centimeter). In the case of pure water, one liter weighs one kilogram. Since each kilogram is 1000 grams, it means that each kilogram is one million milligrams. so 500 milligrams would be equal to half a gram. A gram of pure water then would have a volume of 1 milliliter, so half a gram (500 milligrams) would have a volume of half a milliliter. Please note that this relation between milligrams and milliliters holds for pure water only, because the density of water is 1 gram per cubic centimeter (a cubic centimeter is by definition equal to 1 milliliter). In the case of gold, which roughly has a density of 19 grams per cubic centimeter, half a gram (or 500 milligrams) of gold would then have a volume of 0.5 milliliter divided by 19, or .0263 milliliters.

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15y ago

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