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The density of dry air at 25 °C is 1.184 kg/m^3.
(46*10^-6 g/m^3) / (1.184*10^3 g/m^3) =
(46*10^-3) / (1.184*10^6) ≈
0.03885135 / 10^6 ≈ 0.039 ppm

2007-12-22 00:14:06 · answer #1 · answered by Helmut 7 · 0 0

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