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Conversions & Calc.s  
Concentration

1 % Volume = 10,000 ppm = 10,000,000 ppb
ppm = mL/m3 = µL / L
ppb = µL/m3 = nL/L

mg/L = g/m3 = µg/mL
mg/m3 = ug/L = ng/mL

Conversion of mg/m3 - ppm

c [ppm] = mole volume [L] x c [ mg/m3 ]
molar mass [g]

The mole volume of any gas is 24.1L at 20oC and 1013hPA, the molar mass (molecular weight) is specific to each gas.

Conversion of ppm - mg/m3

c [ mg/m3 ] = molar mass [g] x c [ppm]
mole volume [L]

The mole volume of any gas is 24.1L at 20oC and 1013hPA, the molar mass (molecular weight) is specific to each gas.