Parts per million (ppm) is a way of expressing very dilute concentrations of substances. To calculate ppm, you can use the following formulas depending on what information you have.
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Practical Notes
- For dilute aqueous solutions, 1 ppm is roughly equal to 1 mg/L.
- For gaseous mixtures, 1 ppm is often taken as 1 µL of gas per liter of air.
Summary
PPM is a useful unit for measuring very small concentrations of a solute in a solution. The key point is to match the units correctly and multiply the ratio by 10 rast 6Â to convert to ppm.
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