Originally Posted by Unregistered
I have two values that I am trying to compare.
I have 6.0 mg/kg and need to compare it to 5 mg/L. Is the later less than the former or visa versa?
If the solutions are dilute aqueous solutions then the density is about 1 kg/L, and the 6 mg/kg is the larger value. Otherwise, you need to make a density correction. If you know the density of the first mixture, you can multiply by it to convert to mg/L and compare. Alternatively if you know the density of the 2nd mixture, you can divide by it to convert to mg/kg and compare. Without one of the densities (or at least an approximation) you can't really say.