It is a measure of density.
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1 mg/kg = 1 ppm 1 mg = 1000 micrograms (ug) so 10 ug/kg = 0.01 mg/kg = 0.01 ppm
They are the same: 1 cubic cm = 1 mL
1 US gallon = 4408.9 ml.
divide by 1000 Reason: one cubic mm is 1/1000 the size of 1 ml
1 liter = 1,000 ml 0.1 liter = 100 ml At 1 ml per minute, 100 ml takes 100 minutes. That's 1hour 40minutes.