What does ppm or ppb mean?

One milligram in a kg is 1 ppm (by mass). one liter (l) of pure water at 4ºc and 1 standard atmosphere pressure weighs exactly 1 kg, so 1 mg/l is 1 ppm.

Wisconsin concealed carry license (ccl) free ...

Wisconsin concealed carry license (ccl) free training course participant manual v 2.1

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