Ratio atomic mass (or molecular mass) / valency element (or radical). The milli-equivalent (mé) is the1/1000 part of the valency-gramme; in nutritive solutions, the element concentration is expressed in:
valency-gramme by m3 solution (or milli-equivalent by liter [mé/l]).
gram by m3 (g/m3) or in milligram by liter (mg/l).
