the Motion 6j Electrons in Gases. 



887 



centimetre of a gas at one millimetre pressure and 15° 0. 

 being taken as 3'46 x 10 16 . 



The quantities a x which are also given are the radii of the 

 molecules deduced from the formula given by Jeans* for 

 the viscosity of a gas, taking the number of molecules per 

 cubic centimetre at normal pressure and temperature as 

 2'77 X 10 19 corresponding to the above value of v. 



In the following tables Z is in volts per cm., p in mm. of 

 mercury, \V and u in cms. per sec, and I and a in cms. 



Table IV. — Nitrogen. 

 ^ 1 = l-88xl0- 8 . 



z 



V 



k. 



wxio- 5 . 



MX-10' J . 



/xioo. 



(7X108. 



/." 



100 



180 







154 



60 



126 



193 



129 



2-89 



1-78 



0-9775 



50 



108 



171 



119-4 



2-83 



1-80 



0-9794 



40 



89 



146 



108-3 



2-75 



1-82 



0-9818 



30 



725 



117 



98 



2-67 



1-85 



0-9862 



20 



59-5 



86 



88-5 



266 



1-86 



0-9905 



10 



48-5 



48-5 



80 



2-69 



1-84 



0-99636 



5 



41-3 



27 



73-9 



2-77 



1-82 



0-99869 



3 



35 5 



17-8 



68-5 



2-82 



1-80 



0-99934 



2 



305 



13-1 



635 



2-88 



1-78 



0-99960 



1 



21-5 



8-7 



53-5 



3-20- 



1-69 



0-99976 



0-5 



13 



6-2 



41-4 



3 55 



1-61 



0-99980 



0-25 



7-5 



5-15 



315 



4-50 



1-43 



99976 



Table V.— Hydrogen. 

 oi=l-34 xiq- 8 . 



z 



p' 



, 



wxio-s. 



MX10- 6 . 



I X 100. 



(7X10*. 



/• 



56 



146 



248 



139 



4-27 



1-47 



0-9686 



50 



138 



217 



134-8 



4-07 



1-50 



0-9741 



40 



123 



166 



127-5 



3-67 



1-59 



0-9834 



30 



104 



106 



117 



2-87 



1-79 



0-9921 



20 



78 



72 



101-5 



2-53 



1-90 



0-99524 



10 



44 



40-7 



76-2 



2-15 



207 



0-99742 



5 



25-5 



267 



58 



214 



2 07 



099814 



3 



18-6 



20-2 



49-5 



231 



2 00 



99858 



1-5 



12 



14-4 



39-8 



266 



1-86 



0-9989 1 



1 



9 



11-9 



345 



2-86 



179 



0-99905 



0-5 



5-2 



90 



26 *2 



3-25 



1-67 



0-99904 



025 



3-1 



6-5 



20-2 



3-64 



1 -59 



0-99914 



* Jeans, 'Dynamical Theory of Gases, ' p. 276 (1921). 



