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1 ppm is equal to 1 milligram per liter, expressed as 1 ppm = 1 mg/L. PPM stands for one part per million; a density of 1 means 1000 kg/m³, which is equivalent to 1000000000 mg/1000 L, or 1000000 mg/L. At this density, one part per million is therefore 1 mg/L. PPM stands for one part per million; when used in terms of volume ratio (it can also be applied to mass ratios, but volume ratio is generally used in analysis laboratories), it is related to density. If the density is n kg/L, then 1 mg/L is equivalent to 1/n ppm. The solution process is as follows: ppm stands for “one part per million”; it is a dimensionless value, and either a volume ratio or a mass ratio can be used. mg/L is a \"mass/volume\" ratio and has dimensions. After converting the volume to mass, it can be compared. That is, from “L*nkg/L=nkg”, the following conversion formula is obtained: mg/L = mg/nkg = mg/n1000*1000mg = 1/n10^6 = (1/n)*(1/10^6) = (1/n) ppm. If the solution density is “1 kg/L”, then “1 ppm = 1 mg/L”. The ppm concentration (parts per million) is a concentration expressed as the mass of solute as a millionth of the total mass of the solution, also known as a parts-per-million concentration. It is often used in situations where the concentration is very low; a similar unit is ppb (parts per billion). For gases, ppm generally refers to the molar fraction or volume fraction, while for solutions, ppm generally refers to the mass concentration.