You should also note that because 1 L of water has a mass of 1 kg a measure of mgL of water is also a PPM amount by mass. In weightweight ww terms 1 ppm 1 mg kg -1 1 mg g -1. Mgkg to square micrometerssquare centimeter.
Mgkgper 1 per 10000 mgkg.
Therefore 1 ppm is the same as 00001 so to convert ppm to percent divide the ppm by 10000. 0000001 x 100 00001 e. Free online Fraction conversion. Therefore 1 ppm is the same as 00001 so to convert ppm to percent divide the ppm by 10000.