How many liquid units equal one milligram?

Answer 1

It depends on the density of the liquid. For water, whose density is 1, each gram is one milliliter. One kg is a liter. If the liquid is heavier, like glycerin, whose density is about 2.5, then each milliliter of it wil weight 2.5 grams, one liter of it will weight 2.5kg, or the other way around, one gram of glycerin contains 1/2.5=0.4ml of glicerin, or 1 kg of it can be put in a 400 ml bottle.