91 VISCOSITY OF GASES 243 



where A has the value 



A = 1-203, 



which was found to be the same in all the series of observa- 

 tions, we find for the four temperatures of the observations 

 25-1, 32-6, 35, 40-3 the nearly agreeing values 0-870, 

 0-876, 0-875, 0-877, respectively for s, the mean of which is 



sfffa/tf*- 0-874 



from which further follows 



^/^ = 0-6465, 



so that the ratio in this case only slightly exceeds that re- 

 sulting from the other calculation [viz. 0-631 in the mean]. 



We further obtain the following values of rj l from the 

 values given before for B : 



3 = 25-1 32-6 35 40-3 



B = 378 398 409 404 

 lOfy = 131-9 139-4 143-4 142-3 ; 



and on reducing these to C. by division by 1 + a$, we get 

 for 10% the values 121, 124, 127, 124 respectively. These 

 give values of TJ l that are somewhat smaller than the former 

 mean value 0*000130, but they do not vary very much from 

 their mean value 



r 1l = 0-000124. 



From this follows for the coefficient of viscosity of the gas 

 at when all its molecules are double, or C 2 4 , the value 



77 2 = 0-000192 



which agrees perfectly with the mean ( 0-000194 ) of the 

 numbers found for it from the other formula. 



After this multiplied confirmation of our formulae we can 

 scarcely still doubt that the theory of viscosity in partially 

 dissociated gases which we have developed corresponds to 

 the reality in all essential points. The deviations which 

 occur between calculation and observation will doubtless be 

 completely explained and made to disappear when the 

 calculation is made with more exactness and generality. 



A first improvement that is desirable has already been 



R 2 



