Gas concentration
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This post was last edited by wangshaobo on 2023-12-19 07:17. How to convert between concentration units ppm and mg/m³? For example, what is 30 mg/m³ of CO concentration in the air equal to in ppm?
When converting concentration units from mg/m³ to ppm, we need to know: 1. The molecular weight of the gas; for carbon monoxide (CO), its molecular weight is 28.01 g/mol. 2. The mass of the volume under consideration at standard conditions. Under standard conditions (0°C, 1 atmosphere), the volume of 1 mole of an ideal gas is 22.414 L (or 22.414 m?/kg-mol). The conversion formula is: Since 1 ppm = 1 μg/g, we use this formula for the conversion. Under standard conditions of 0°C and 1 atmosphere of pressure (101.325 kPa), the density of air is approximately 1.293 kg/m³. Assuming the density of air is 1.293 kg/m³ and the molecular weight of carbon monoxide is 28.01 g/mol, we now convert a CO concentration of 30 mg/m³ into ppm: \ Note the unit conversion: mg must be converted to g, remembering that 1000 mg = 1 g. \ \ \ \ Therefore, a CO concentration of 30 mg/m³ in air is approximately equal to 24.08 ppm. .