There is 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 millilitre if Mercury. How many milligrams?
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They are different units of measurment - mls are volume and mgs are weight.
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?"
10 of them
25 mls