where P(atom) is the atmospheric pressure in the laboratory at room temperature in hPa. P(w) is the
vapor pressure of water at room temperature in hPa (from the water vapor pressure table in the CRC
handbook [4]). V(m) is the measured gas volume in the gas sampling bag using a glass syringe in
liters. This CO2 and CH4 volume was converted to the volume V(s) under standard conditions (at
273K, 1013 hPa) as indicated by Equation (2)