ANSWER
It is impossible, without additional information. "milliliter" is unit of volume and "milligram" is unit of weight. You need to know the density of substance.
For example, 1 liter of water weigh 1 kilogram, but 1 liter of gasoline weigh less then 1 kilogram
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To convert milliliters to milligrams, you need to know the density of the substance in question. Once you have the density, you can multiply the volume in milliliters by the density in milligrams per milliliter to get the mass in milligrams. The formula is: mass (mg) = volume (ml) x density (mg/ml).
Directly there is no conversion.
However, mass (in milligrams) and volume (in millilitres) for a substance are related by density:
density = mass/volume = mg/ml
If, however, you are talking about medicine dosage, then the mg of the drug in the ml of the solution will depend upon the concentration of the drug (again in mg/ml).
There can be no conversion. A milligram is a measure of mass. A millilitre is a measure of volume. The two measure different things and, according to basic principles of dimensional analysis, conversion from one to the other is not valid. Consider a millilitre of air. How many milligrams? Next consider the same volume of water. How many milligrams? The masses of equal volumes of the two substances will clearly be very different.
To convert milliliters (ml) to milligrams (mg) for a liquid, you need to know the density of the substance. Once you have the density, you can multiply the volume in milliliters by the density in milligrams per milliliter to get the mass in milligrams. Without the density, it's not possible to convert directly from ml to mg.
It can't be done. Additional information. Your 15 milliliters is 15 milligrams of water, but there is no direct conversion for other substances because of their different densities. Milliliters is a measure of volume, and milligrams is a measure of mass (weight). This question is similar to the question, "How do you convert gallons to pounds?" A gallon of water weighs more than a gallon of gasoline, and way less than a gallon of liquid mercury. Do you see the problem? Unless you have a conversion factor for the substance or a density or specific gravity of that substance, you can't get there from here.
To convert milliliters (mL) to milligrams, we need to know the density of the substance in question. The number of milligrams in 355mL will vary depending on the substance.
The number of milligrams in 30 ml depends on the substance being measured. To convert milliliters to milligrams, you need to know the density of the substance in question. Once you have the density, you can multiply it by the volume in milliliters to get the mass in milligrams.
To convert milliliters (ml) to milligrams (mg), you need to know the density of the substance. Without the density, it is not possible to directly convert between volume and mass.