TABLES XIV, XV. 2O? 



TABLE XIV. RELATION BY WEIGHT AND VOLUME OF THE 

 COMPONENTS OF AIR. 



Air contains by volume : 



Nitrogen 78.35 



Oxygen 20. 77 



Aqueous vapor 0.84 



Carbonic acid 0.04 



100.00 



Deducting the carbonic acid and aqueous vapor, we have : 

 Nitrogen .... By volume : 79.04 By weight : 76.83 



Oxygen " " 20.96 " " 23.17 



100.00 100.00 



Ratio of nitrogen to oxygen : 



N N 



By volume, = 3.771. By weight, =3-32. 



Ratio of air to oxygen : 



-r, Air . , Air 



By volume, := 4.771. By weight, = 4.315. 



Ratio of air to nitrogen : 



n - _ . , Air 



By volume, = 1.265. By weight, = 1.302. 



TABLE XV. IGNITION POINT OF GASES (Mayer and Miinch).* 



Marsh gas, CH .............. 667 C. 



Ethane, C 3 H 6 ............... 616 



Propane, C 3 H t .............. 547 



Acetylene, C 2 H 2 ............ 580 



Propylene, C 3 H 6 ............ 504 



* Berichte der deutscher Gesellschaft xxvi, 2421. 



