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CO密度: 1.250 g/L at 0 °C, 1 atm, 1.145 g/L at 25 °C, 1 atm,
因為1 ppm = 1mg/kg
所以at 25 °C, 1 atm
1 ppm = 1 mg/(1kg/(1.292 kg/m^3)) = 1.292 mg/m^3 = 1.292 mg /(1.250 kg/m^3)/m^3 = 1.034e-6 atm
1 mg/m^3 = 0.774 ppm
1.0e-6 atm = 0.967 ppm
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