AndreChE:
To convert the concentration of a gas component from a dry basis to a wet basis, you must first know the water vapor content of the total gas:
wet basis concentration = (dry basis concentration)(1 - w)
where:
wet basis concentration = volume %, volume fraction, or ppm by volume
dry basis concentration = volume %, volume fraction, or ppm by volume
w = volume fraction of water vapor in the total gas
Milton Beychok
mbeychok@xxx.net (replace xxx with cox)
(Visit me at www.air-dispersion.com)