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There can be no equivalence.
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.
If you are not convinced, consider a millilitre of air. How many milligrams? Next consider a cubic millilitre of water. How many milligrams?
The masses of equal volumes of the two substances will clearly be very different. So there is no direct conversion between mass and volume: you need to know the density of the substance to enable you to carry out the conversion.
Some people still believe that there is a conversion in relation to pure water but that is only approximately true. Until 1964 (nearly 50 year ago!) a litre was defined as the volume of one kilogram of pure water at 4 degrees Celsius and at a pressure of 760 millimetres of Mercury. With that definition a conversion would have been possible - but only for pure water and only under those conditions. In any case that definition of a litre was abandoned in favour of 1 litre =1000 cubic centimetres.
So, the MAXIMUM density of pure water, at 4 deg C and 760 mm of mercury is 0.999 972 0 mg/ml
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How do you convert 60 mg into 10 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.
How many mL are in 60 mg Demerol?
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.
How much is 135 mg mL?
Does not convert; milligrams (mg) and grams (g) are measures of weight or mass and mL (milliliters) is a measure of volume.
How much is 9 mg liquid in ml?
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.
How many ml do you give if bottle says 5 mg per 2 ml and you need to give 15 mg?
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).
