To convert milligrams (mg) to milliliters (ml), you need to know the density of the substance in question, as the conversion depends on the material's specific gravity. For example, if you are converting water, which has a density of 1 g/ml, 650 mg would equal 0.65 ml. However, for substances with different densities, the conversion will vary. Always refer to the specific density to perform accurate conversions.
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depends on the substance density
You have to give 3 times 5 mg = 15 mg therefore you have to give 3 times 2 ml = 6 ml (15 mg = 6 ml of whatever that bottle contains).
This cannot be sensibly answered. A milliliter (mL or ml) is a measure of volume, mg is a measure of weight or mass.
It looks like the 3.5 ml may be extraneous information. If 1 ml yields 250 mg, then you need 400/250 = 1.6 ml, to get 400 mg.
Does not convert; milligrams (mg) and grams (g) are measures of weight or mass and mL (milliliters) is a measure of volume.