Gas Mixtures 2

[mielke]

Does anyone know if it is common to specify the gas mixture as a percent weight or a percent volume?

 

[Latexman]

I have found it most common as volume %, but I've seen mass %. I think the reason volume % is most common is that's what comes out of a gas chromatograph (actually area %, but that's proportional to volume % and mole %)

Good luck,
Latexman

 

[dcasto]

Mole% is how GC reports are prepared and all calibration gases are in mole%. Then by definition that's volumen %. GPA 2172 has the detailed calculations for conversion and adjustments for compressibility.

 

[siretb]

%volume or %mole
Think of stating whether it's dry basis or total basis if moisture is present.
If moisture is present, the common use is %volume, total(wet) basis for H2O ; and for the rest (N2, O2, NO, SO2, ...) %volume, dry basis.