posted by sarah .
how do i convert mg m-3 / day to gs -1
This is not my area, but here's a GOOGLE Search on your post:
P.S. Here is a site that will convert just about anything:
There is no such conversion, because one side is (Mass)/[(Volume)*(Time)] and the other is [Mass]/[Time]. You nedd to have the same KINDS of dimensions on both sides (mass, length, time and charge)
You mmay have copied the problem wrong.