of Hydrogen and tome other Gases. 329 



the mean value being 



fc, = -0-26,xlO-. 



The volume susceptibility of nitrogen at 20° and 760 mm. 

 pressure is 



^ r = -0-00030 9 xl0- 6 . 



The second method of preparation was due to Mai *. To 

 a mixture of ammonium nitrate and glycerine contained in a 

 flask, a few drops of strong sulphuric acid were added, and 

 the mixture was heated in an oil-bath at about 160° 0. The 

 generated gas was collected in a reservoir after passing it 

 through a strong solution of caustic potash. Before the gas 

 was introduced into tbe compressing cylinder, it was passed 

 through the trains of purifiers, which were the same as 

 those used in the former case, except that in this case the 

 solution of ferrous sulphate was replaced by a strong solution 

 of caustic potash. 



One example of the experimental data of the measurement 

 for the nitrogen prepared by the second method is given in 

 the following table : — 



Table IX. 



Jan. 17, 1917. 





N 2 (p 



= 25atm.) 







Vacuum. 





4 h ; 



p.m., *=19°-0C., b 



=200, 



4 1 ' 50 ra p.m., *=19°-5 C., 6=20-0, 



m N*+ m o 



=89-4828 



gm. 





mo =89-3651 gm. 





C. 



S. 



0. 



'». 



C. 



S. 8. 



l V 



amp. 



cm. 



em. 



cm. 



amp. 



cm. cm. 



cm. 







57-70 



- 9-35 



-10-40 







59-80 -6-50 - 



■7-00 



10 



48-35 



-11-45 



-10-47 



10 



53-30 -7-50 - 



■7-90 







59-80 



- 9-50 



-10-38 







60-80 -8-30 - 



•8-15 



10 



50-30 



-11-25 



-10-28 



10 



52-50 -8-00 - 



-7-85 







61-55 



- 9-30 



-10-32 







60-50 -7-70 - 



-7-65 



10 







52-25 

 63-60 



-11-35 





10 



) o 



52-80 -7-60 - 

 60-40 -7-60 — 



-7-60 



— 1037 (mean 











10 



52-80 



-7'69(mean) 





Air 



(p=l atm.) 





Calculation 





6 1 



1 P.M., t= 



= 18°-5C, 



6 = 20-0. 



<W 



= -10-37 + 7-69=- 



-2-68 cm.. 





m a -\-m t 



3 =89-370C 



igra. 



*a- 



= 1-604-7-69=9-29 



cm., 



C. 



S. 



3. 



m- 



m N-i- 



=0-1177 gm., m a =0-0049 gm., 



amp. 



cm. 



cm. 



cm. 





-2-68 K 

 ~ 01177 -"" ■ 









70-60 



070 



1-45 



X N 2 - 



76 K. 



10 



7120 



2'20 



1-70 













10 



69-00 

 70-20 



1-20 

 1-90 



1-55 

 1-70 



Xa 



Q-'>9 K 

 = 0^049 = 1895K ' 









68-30 



1-50 







*m 



22-76 

 = fs?7r= -00120 





10 



69-80 





1-60 (mean) 



/Ca 



1895 





* J. Mai, Ber. d. DeuUch. Chem. Ges. iii. p. 3805 (1901). 



