CALCULATION OF RESULTS. 87 



The air in section III is subject to a fluctuation as a result of the 

 increase in volume in the first water-absorber, and consequently the 

 initial volume in this particular case, 14.60, must be decreased by the 

 volume of the water absorbed, 0.04, ' yielding a volume of 14.56 liters. 

 This volume is likewise reduced to standard conditions, and, since it 

 contains carbon dioxide, the reduced volume, i. e., 13.49, is added to the 

 volume of V n giving 4,555.96 liters as the volume of air containing 

 carbon dioxide, i. e., V 2 . 



The air in section IV consists of the constant volume of 41. 08 liters, 

 which represents the volume of the air-pipes and the fluctuating vol- 

 ume inclosed in the pans. The amount so inclosed during this particular 

 period is 13.7 liters, 2 making a sum total of 54.78 liters. The apparent 

 volume of air in section IV is also reduced to standard conditions, and 

 when so reduced it amounts to 50.75 liters, which, when added to V 2 , 

 equals 4,606.71 liters, or V 3 , the total volume of air in the system. 



TOTAL RESIDUAL WATER VAPOR. 



Since the amount of water vapor in the sample and the corrected 

 volumes of both sample and residual air are known, the calculation of 

 the total residual amount of water vapor is a simple matter. The 

 computations are made on the right of the residual sheet. To the log- 

 arithm of the weight of water found in the air sample are added the 

 cologarithm of the corrected volume of air withdrawn in the sample v 

 and the logarithm of the corrected volume V t of residual air contain- 

 ing water vapor. In the instance here cited there were 28.72 grams 

 of water vapor in the air-circuit. 



It is convenient to know not only the weight of water vapor in the 

 air, but also the volume, and consequently the computation is carried a 

 step farther by adding the logarithmic factor .09462 to the logarithm 

 of the weight of w.iter, thus indicating that 35.71 liters of water vapor 

 were in the system. 



TOTAL RESIDUAL CARBON DIOXIDE. 



The residual amount of carbon dioxide in the whole closed circuit is 

 determined in a similar manner, i. e., by adding together the logarithm 

 of the weight of carbon dioxide found in the sample, the cologarithm of 

 the corrected volume of air taken for a sample, z' , and the logarithm 

 of the total volume of air containing the carbon dioxide (V. 2 ), i, e., the 



1 The calculation for the amount of air displaced by the water absorbed is made 

 on the sheet, page 64. 



2 For the calculation of this volume of air, see the record sheet, page 64. 



