54 



Titer mat Conductivity and Viscosity of Gases. 

 Table II. 



12 3 4 





/ obs. 



/ cal. 





Molecule. 



Vo c P 



7-32 ( y -l) 



He 



A 



H 2 



N 2 



o 2 



Air 



ci 2 



CO 



NO 



H,S 



2-32 

 251 



1-91 

 1-9(5 

 1-91 

 1-96 

 1-70 

 1-82 

 1-90 



1-41 

 1-58 

 1-60 

 1-35 

 1-35 



1-79 

 1-52 



2-45 

 2-51 



1-90 

 1-93 

 1-90 

 1-91 

 163 

 1-89 

 1-87 



1-70 

 1-56 

 1-65 



1-39 

 1'32 



1-69 



1-61 



1-43 



11-6 



124 



13-2 



134 

 133 

 13-5 

 13-8 

 12-7 

 12-9 



11-7 

 14-0 

 150 

 133 

 165 



12 6 

 153 



146 



159 



18-3 



C0 2 



N 2 



S0 o 



cs 



NH 3 



o H o 



CH 4 



CJS, 



1-40 



C H fl 





with those in column 2. There are certainly large differences 

 between the calculated and observed values for some gases, 

 but the experimental determinations cannot be considered in 

 all cases as final. 



The last column of Table II. contains the values? of 

 myk /7) Q . As previously mentioned, with the present experi- 

 mental results, constancy of the value of the ratio is only to 

 be expected in the case of perfect gases with molecules of an 

 atomicity greater than 2. The approximate similarity of the 

 figures in some number of instances is, therefore, perhaps 

 more remarkable than the divergencies in the other cases. 



It is interesting to note the rise that has taken place in the 

 values of the thermal conductivities. For many years tbe 

 determinations of f for diatomic gases were cited in support 

 of Meyer's well-known theoretical deduction, /= 1*6027. 

 Now, from Eucken's measures of the thermal conductivities, 

 the value of /for these gases is 1*9. 



The University of Sydney, 

 September 20th, 1915. 



