The answer depends on the density of the substance because milliliters are units of volume and milligrams are units of mass. 150 ml of pure water at standard temperature and pressure have a mass of 150 mg.
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The mass of 0.23 kg of pure water is equal to 230 grams. Given that the density of pure water is 1 g/ml, the volume of 230 grams of water would be 230 ml.
There's no single answer to that, as ml is volume and mg is weight. Depending on the density of the substance the answer will be different.
The answer depends upon the density of the fluid. Density has units mass/volume and millilters, ml, is a measure of volume and milligrams, mg, is a measure of mass, The mass in milligrams is then, mass (mg) = volume (ml) x density (mg/ml). The tabular value of density given in various references are usually expressed in grams/cubic centimer or kilograms/cubic meter and you will need to convert the given value to mg/ml.
16 ml of Elixophyllin elixir is required for a dose of 240 milligrams (240 mg divided by 80 mg/15 ml).
This is not a valid conversion; milligrams (mg) and grams (g) are measures of weight or mass and mL (milliliters) is a measure of volume.