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So, a milligram is one ppm of a kilogram; therefore, one ppm is the same as one mil-ligram per kilogram. â¢ milligram/kilogram or â¢ mg/kg or â¢ 0.001/1,000 or â¢ 10-3/103 38 On Tap Fall 2004 What does ppm or ppb mean? What is ppm and what does it mean? Most contaminants are expressed as parts per million (ppm).This means
PPM-Parts Per Million: Number of grams of solute per 1 million grams of solution. ppm=[mass of solute/mass of solution]*10 to the 6th power.&. PPB-Parts Per Billion: Number of grams of solute per 1 billion grams of solution.ppb=[mass of solute/mass of solution]*10 to the 9th power. The unit is used to calculate the concentration ofâ¦. 2  How Strong Is that Solution: The Definition of PPM Chemistry often works with solutions of substances such as acid and water, to conduct experiments. 3  However, often the substances being experimented with are microscopic in suâ¦.