Viscosity of Hydrogen, Nitrogen, and Oxygen. 593 

 In Table II. below are results obtained for nitrogen. 



Table II. 

 Viscosity of Nitrogen. 



No. of Temperature Temperature Mean 



observation. at beginning. at end. Temperature. »/Xl0 7 . 



°c. °c. °c. 



1 23035 22-995 23-010 1764-90 



2 23-020 22-995 23-008 1764-59 



3 22-950 23-050 23-000 176239 



4 22-990 23-015 23-002 1765-12 



5 23-040 23 030 23-035 1764-67 



6 ,.. 22-940 22940 22-940 1765-04 



7 22-990 22-995 22992 1763-98 



8 23-010 23-000 23-005 1765-00 



9 22-960 22990 22975 176467 



10 22-990 22-995 22-992 1765-01 



11 23-000 22 930 22-965 1766-39 



12 23-010 23-010 23-010 176462 



13 22-995 23-000 22998 1765-12 



14 23-005 ' 23-010 23008 1766 14 



15 22-995 22-995 22995 176489 



16 23-010 23-010 23-010 1765-14 



17 22-995 23-005 23-000 1764-66 



18 23005 23-005 23005 1766-24 



19 22-990 23 005 22-998 176492 



20 23-010 22-970 22990 1764-46 



21 23-030 23-050 23040 1765-79 



Mean 22-999 1764-797 



During the observations the gas-con tent of the chamber 

 was changed three times, and the results show no indication 

 whatsoever of any variation greater than that allowed bv 

 the limit of accuracy of the method. 



The Viscosity of Oxygen. 

 The oxygen here used was produced by dropping distilled 

 water upon chemically pure sodium peroxide. The che- 

 micals were made by J. T. Baker Chemical Co., Phillipsburg.. 

 N.J. The maker's certified analysis gave the following; 

 impurities :— 



Fe = 0-002 pep cent. 



A1 2 3 = 0-001 .. 



CI = 0001 .. 



SO, = 0-001 „ 



P = none. 



Insoluble matter = trace. 



