Indoor Air Unit Conversion Background
However, indoor air units are not expressed as a mass-per-mass ratio, even though they are given as ppm or ppb. The units of ppm and ppb in gas systems are computed on a volume -per-volume ratio and should more accurately be termed ppmV and ppbV. For example: So, how do we convert between the mass -per-volume units and ppmV or ppbV in a gas system?
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