'222 Dispersion and Size of Molecules of Hydrogen, Sfc. 



satisfying (13) is now /e = 3 (which, again, happens to 

 coincide with the " valency " of nitrogen). Thus 



^ = 3£ = 5-49.10 10 (N) 



Proceeding exactly as in the above two cases, I find 



cr& = 0-4158, (23) 



and the atomic attributes of nitrogen 



6 =1-782 ; ^o=0*580. 10" 10 o.G.s. ; W= 570-5 A. (24) 



Whence <r = 0*2334 and, the interatomic distance in a 

 molecule of nitrogen, 



R = 1-493. 10" 8 cm., . .... (25) 



while the values of the molecular semidiameter furnished by 

 the kinetic theory of gases are : 



Boyle's Law. 



1-56 



Viscosity. 



1-448 



Heat-conduction. 



1-37 



Here again the distance R differs much less from the 

 viscosity-value than the several kinetic values do among 

 one another. 



Collecting the above scattered results, together with those 

 of the kinetic theory of gases, we have the following Table, 

 in which it has seemed convenient to replace the atomic 

 coefficients b Q , gt by the values of k and the free wave- 

 lengths X , characterizing equally well the optical properties 

 of the atoms. 





ml »e t 







Kinetic Theory of Gases. 





Semidiameter of molecule. 



Atom. 



Mw 



i/o 



Diatomic 



molecule. 



B. 



Boyle's 

 Law. 



Viscosity. 



Heat- 

 cond. 



Dif- 

 fusion. 



H... 



O ... 



N... 



649-4 

 622-6 

 570-5 



€ 



2e 



3e 



1-067 

 1-265 

 1-493 



1-025 

 1-56 



1-024 

 1-405 

 1-448 



0-995 



1-29 



1-37 



1-01 

 1-35 



All lengths are in 10 8 cm., and e, the electronic value of 



1^-- — , is equal to 183 . 10 8 cm. gr."\ as in (10). 

 127I-V m mn 



