None.
A milligram is a measure of mass while a litre is a measure of volume. The two measure different things and it makes no sense to try to convert from one to the other unless you have a very specific substance in mind.
For example, the mass of a litre of air will be very substantially less than the mass of a litre of treacle.
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.001mg
31.1 (milligrams per liter) = about 1.817 grains per US gallon.
Grams is weight. Liter is volume. The answer would depend on the density of the substance.
1 gram = 1000 milligrams 1 liter = 1000 milliliters 1 meter = 1000 millimeters
There are 0.085 milligrams in 0.085 milligrams.