How do you convert 250 mg to cc?

Answer 1

The question, as stated, cannot be answered sensibly. A cc is a measure of volume, with dimensions [L3]. A milligram is a measure of mass, with dimensions [M]. The two measure different things and elementary dimensional analysis teaches that you cannot convert between measures with different dimensions such as these without additional information.

As a simple mental exercise consider a cc of air and of water. They will have very different masses.

Answer 2

There is no sensible answer to this question. A cubic centimetre is a measure of volume, with dimensions [L3]. A milligram is a measure of mass, with dimensions [M]. Basic dimensional analysis teaches that you cannot convert between measures with different dimensions without additional information. A little though will make this obvious. One milligram of air will occupy a much greater volume than one milligram of lead.

Answer 3

This is not a proper conversion. Cubic centimeters (cc) is a measure of volume. Grams (g), kilograms (kg) and milligrams (mg) are measures of weight or mass.