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Re: [APD] ppm and mg/l


ppm of a substance only equals mg/L of a substance when the solvent is H2O. We know that 1 liter (L)
of water weighs exactly 1 kilogram (kg). Therefore, 1 miligram (mg) of anything in one liter of water equals
1 part per million (ppm) because a milligram is equal to a millionth of a kilogram (ppm=mg/L H2O).  So, 20 ppm CO2 does equal 20 mg/L CO2 in water.


Brian's Planted Aquaria

> > Hi all,
> >
> > I am in trouble.
> > ppm = mg/l as long as we talk about solutions. But if we
> > gas CO2 into water what about
> > then with the equation? Is 20ppm CO2 still 20mg/l CO2?

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