There is no equivalence.
A milligram is a measure of mass. A cubic centimetre 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 cubic centimetre of air. How many milligrams? Next consider a cubic centimetre of lead. 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.
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6.7 mgs?
"Mgs" usually stands for milligrams. Milligrams is a measure of mass. Quart is a measure of volume. The two cannot be converted. Is is like asking "how many pounds are in a gallon?"
This question cannot be answered sensibly. A cubic centimetre (cc) is a measure of volume, with dimensions [L3]. A milligram (mg) is a measure of mass, with dimensions [M]. Basic dimensional analysis teaches that in most cases you cannot convert between measures with different dimensions without additional information. A little thought will make it obvious that 150 mg of air will occupy much more volume than 150 mg of lead.
They are different units of measurment - mls are volume and mgs are weight.
A Grasshopper weights about 300 mgs. Therefore there would be 151,197.56 in 100lb.