depends on the substance density
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Does not convert; milligrams (mg) and grams (g) are measures of weight or mass and mL (milliliters) is a measure of volume.
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.
375ml
You can not directly equate mass (mg) and volume (ml) without knowing the density of the substance being measured. For instance 9mg of liquid mercury would occupy a much smaller volume than 9 mg of water.
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).