552 



Intelligence and Miscellaneous Articles. 



If in the case of hydrogen, for which the molecular radius is small- 

 est, we take ?\=\ t remembering that m 1 — '2, and rj 1 = 0*000134, 

 equation (3) assumes the form 



r 2 =0-0000948 ^ m 



,= a/° 



0000948^. 



r 3 =0'0000948 



v; 



V ' 



0000948 



V 



(4) 

 (5) 

 (6) 



The values adduced in the last three columns of the followin| 

 Table have been calculated by these three equations. 



Names of the gases. 



Hydrogen 



Oxygen 



Nitrogen 



Chlorine 



Carbonic oxide 



Nitric oxide 



Hydrochloric acid 



Carbonic acid 



Nitrous oxide 



Sulphuretted hydrogen 



Sulphurous acid 



Ammonia 



Cyanogen 



Marsh-gas 



Chloride of methyle ... 



Ethy ene 



Chloride of ethyle 



Methylic ether 



Composi- 

 tion. 



H 2 



G 2 



N 2 



CI 2 



€9 



N0 



HC1 



€0 2 



N 2 G 



H 2 S 



SO 2 



NH 3 



€ 2 N 2 



GH 1 



GH 3 C1 



G 2 H 4 



G 2 H 5 C1 



G 2 H 6 G 



No. of 

 atoms. 



Mole- 

 cular 

 weight, 



2 



32 



28 



71 



28 



30 



36-5 



44 



44 



34 



64 



17 



52 



16 



50-5 



28 



64-5 



46 



Coefficient 

 of friction, 



0-000134 

 306 

 267 

 210 

 266 

 269 

 225 

 231 

 231 

 188 

 200 

 156 

 155 

 174 

 167 

 158 

 153 

 148 



Ratios of the 



Mole- 

 cular 

 sections. 



1 



1-75 



1-88 

 3-80 

 1-88 

 193 

 2-54 

 2-72 

 2-72 

 294 

 3 79 

 2-50 

 4-41 

 2-18 

 4-03 

 317 

 4-97 

 4-34 



Mole- 

 cular 

 radii. 



1 



1-32 



1-37 



1-95 

 1-37 

 1-39 

 1-59 

 1-65 

 1-65 

 1-71 

 1-95 

 1-58 

 210 

 1-48 

 201 

 1-78 

 2-23 

 2-08 



Mole- 

 cular vo- 

 lumes*. 



1 



2-32 

 2-57 

 741 

 2-59 

 2-68 

 4 06 

 4-49 

 4 49 

 5-04 

 7-38 

 3-96 

 9-26 

 3-22 

 810 

 5-65 

 1109 

 9 05 



It follows from equation (4), that bodies which with equal mole- 

 cular weights have also equal coefficients of friction, like nitrogen 

 and carbonic oxide, nitrous oxide and carbonic acid, have also equal 

 relative numbers for their molecular magnitudes. Ethylene has, it 

 is true, the same molecular weight as nitrogen and carbonic oxide, 

 but a different coefficient of friction, and therefore a different relative 

 molecular magnitude. With all their other differences, the molecular 

 magnitudes of sulphurous acid and chlorine agree very closely, as 



* By molecular volume is to be understood the space occupied by a mo- 

 lecule, into which other masses cannot penetrate without destroying the 

 previous condition of the molecule. 



