Milligrams and milliliters are two different measures, milligrams measure mass and milliliters measure volume and you can not convert one to the other.
This is not a valid conversion; milligrams (mg) and grams (g) are measures of weight or mass while milliliters (mL or ml) measure volume.
This is not a valid conversion. Milliliters (mL or ml) and liters (L) are measures of volume. Grams (g), kilograms (kg) and milligrams (mg) are measures of weight or mass.
15 ml
2.5 ml
This cannot be sensibly answered. A milliliter (mL or ml) is a measure of volume, mg is a measure of weight or mass.
cc = ml if you assume that density is 1 g / ml, you assume a gram is a millilitre then 300 mg / ml = 300,000 mg per kilogram
This is not a valid conversion; milligrams (mg) and grams (g) are measures of weight or mass while milliliters (mL or ml) measure volume.
300 grams of water is 300 ml.
300 g = 300000 mg
This is not a valid conversion. Milliliters (mL or ml) and liters (L) are measures of volume. Grams (g), kilograms (kg) and milligrams (mg) are measures of weight or mass.
This is not a valid comparison; milligrams (mg) is a measure of weight or mass while milliliters (mL or ml) measure volume.
Does not convert; milligrams (mg) and grams (g) are measures of weight or mass and mL (milliliters) is a measure of volume.
Milligrams and milliliters measure different things (milligrams measure mass and milliliters measure volume), so there is no universal conversion factor. For example, 300 mg of air takes up about 250 ml, whereas 300 mg of water takes up only 0.3 ml. To get an answer you need to specify what substance you are measuring, or, if the substance is in solution, you need to specify the concentration of the solution.
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.
Accordingly, 1 ml = 1/7.5 mg = 0.133 mg
This is not a valid conversion. Milliliters (mL or ml) and liters (L) are measures of volume. Grams (g), kilograms (kg) and milligrams (mg) are measures of weight or mass.
84 mg/ml, or 1680 mg/20 ml