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You are comparing 2 different things: weight and volume. So this question cannot be answered, unless you tell me what substance you are working with =] First of all, mg is a measure of weight and ml is a measurement of volume, to determine how many ml 400mg is we need to know what density or Specific Gravity (SG) the substance is. Water has a SG of 1 and a density of 1kg per liter.

there are 1000mg in 1 gram and a 1000 grams in a kilogram (about 2.2 pounds) so 400mg=0.0004 kilograms.

The density of Gold is about 19.3kg per liter ( or 19.3 grams per ml).

The formula for density is D=m/v (Densityequals mass over volume) Mass divided by volume.

Also see http://wiki.answers.com/Q/What_is_the_formula_for_density

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16y ago

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