The conversion process from ppm to milligrams per cubic meter!
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This post was last edited by chqd812 on 2017-3-31 at 10:42. Baidu shows that mg/m3 = M/22.4·ppm·*（Ba/101325). Could some experienced member please explain the calculation process? I’m not very familiar with this topic, so a detailed explanation would be appreciated. ppm is equivalent to mg/L, and 1 cubic meter equals 1000 liters; I think 1 mg/L is equal to 1000 milligrams per cubic meter
Here is an article that I hope will help you understand the conversion between ppm and milligrams per cubic meter: https://wenku.baidu.com/view/9299e9d3c0c708a1284ac850ad02de80d5d80652.html
PPM has no dimension, that is, it has no units – 1/1,000,000!
PPM stands for one part per million; in my understanding, it can refer to mg/kg, ml/m3, or mg/l. In the formula above, ppm should refer to volume concentration, that is, ml/m3. You can refer to http://bbs.hcbbs.com/thread-79255-1-1.html for a very detailed explanation
Assuming it is an ideal gas, the volume occupied by 1 mg of gas is 1 mg*22.4/M. ppm represents either a volume fraction or a mass fraction, and is one part per million; therefore, ppm = mg*22.4/M*m3, or ppm = (mg/m3)*22.4/M. Hence, mg/m3 = (M/22.4) ppm. By then applying the ideal gas law to convert this value into a volume at a certain pressure and temperature, the formula given in the question is obtained
Also, it’s not very good to set the reply to be visible only to the author; once the question is answered, it should be visible to everyone so that more people can learn from it*
PPM means one part per million.
Approximate simple algorithm: Multiply by the molecular weight and divide by 22.4
Your premise is wrong. Who said that PPM equals milligrams per liter? PPM is a dimensionless value, just like a percentage; it represents a proportion, while milligrams per liter refers to a mass-to-volume ratio. How can they be directly converted? Additionally, milligrams per liter is used for liquids, whereas cubic meters is used for gases