some other Constants of tlie Inactive Gases. 



805 





ju. for X = oo . 



fi-1. 



<7 3 . 



i 



He ... 



1-0000347 



3-47x10-5 



1-607x10-24 



1-17X10-8 cm. 



Ne ... 



1-0000685 



6-85x10-5 



3-17 XlO-24 



1-47X10—8 cm. 



A ... 



1-0002792 



27-92x10-5 



12-92 x 10-24 



2-35x10-8 cm. 



Kr ... 



10004189 



41-89x10-5 



19-4 X 10-24 



2-69x10-8 cm. 



X ... 



1-0006823 



68-23x10-5 



31-6 X 10-24 



3-16x10-8 cm. 



From the two equations 





9 



b — 5 . 7rN<7 



and 



/"-l = ftf<T* 3 



we get 



,-1-fJ.*. 



Let us see how far this relation holds good for the inactive 

 gases. The table gives the comparison. 





fi-1. 



8 i 



3 .M-1. 



b. 



f.*-l. 



He ... 



00000347 



0-0000925 



00007 



7-57 



Ne ... 



0-0000685 



0-0001826 



? 



9 



A ... 



0-0002792 



0-0007445 



0001347 



1-81 



Kr ... 



0-0004189 



0-001115 



0-001774 



1-59 



X ... 



0-0006823 



0-00182 



0002304 



1-26 



The agreement is not particularly good. Regarding some 

 possible explanations of the anomalies reference may be made 

 to Jeans, I.e. chap. xix. 



3. Calculation of a from the viscosity coefficient rj. 



We can also calculate the value of a from the viscosity 

 coefficient, Combining the two equations 



and 



we get 



equ; 

 77 = O-300G7 / oLfl 



0- 3090)7 p d 

 /2tt 'Ne? 



V = 



Jeans (I. c. p. 250) deduced the relation 

 _ 0-44 pH 



Phil. Mag. S. 6. Vol. 17. No. .102. June 1909. 



(I \ 



(II.) 



31 



