60 SPECIFIC GRAVITY OF GASES. 



The following Table will show the connexion 

 between the specific gravity of gaseous bodies 

 and their atomic weights. The first column of 

 figures represents their specific gravities, com- 

 pared with common air as a standard, as de- 

 duced from the experiments of Thomson, Prout, 

 Berzelius, Dulong, Gay-Lussac,Ure, Dumas, and 

 Mitscherlich, under the ordinary pressure of the 

 atmosphere, and at the temperature of 60* F. with 

 the exception of phosphorus, sulphur, arsenic, 

 and such other bodies as require higher tempe- 

 ratures to convert them into the gaseous state. 

 The second column exhibits the number of 

 grains in 100 cubic inches ; while the third co- 

 lumn gives the relation of their specific gravity 

 to that of hydrogen as unity ; and is obtained by 

 dividing the numbers in the first column, by the 

 specific gravity of hydrogen. 



Gases and vapours. Specific gravities. ^ ot &*\ ns in pared wiS 



bes ' hydrogen. 



Atmospheric air 1-000 31-01 15 



Chlorine 2-500 Cl 76-20 36 



Iodine vapour 8-7161 265*76 126 



Bromine do 5-555 Br 169-29 80 



Carbon vapour -416 C 12-68 6 



Carburetted hydrogen -555 C H. 2 . . 17-30 8 



Olefiant gas -981 C 2 H 2 . 29-90 14 



^Etherine vapour 1-963 C 4 H 4 .. 61-13 28 



Carbonic oxide -972COorC 29-62 14 



Carbonic acid . . 1-527 C . 47.26 . 22 



