NITROMANN1TE. 429 



stant pressure, the water being liquid, or 689 - 6 at constant 

 volume. Or, for 1 kgm., at constant pressure, 2513 Cal. ; at 

 constant volume, 1529 Cal. 



C 6 H 2 (N0 3 H) 6 = 6C0 2 + 4H 2 + 3N 2 + 2 . 



Sarrau and Vieille found 1512 at constant volume, and 

 proved, further, that the decomposition really takes place 

 according to the above equation. 



The heat of combustion is inferior to that of nitroglycerin 

 and of nitroglycol, an inferiority due to the formation of a 

 larger amount of free oxygen. 



10. Volume of the permanent gases for 1 equiv. 



223 litres ( 1 + -^r J; the water being gaseous, ( 1 + - J 312 litres. 



The water being gaseous, we should have for 1 equiv. at 

 constant pressure + 603*9 Cal., at constant volume + 612 Cal. 



Or, for 1 kgm., 494 litres (l + \ for the permanent gases, 



692 



litres (l + TZJJ) the water being gaseous. 



612000 Cf7ino 



11. Theoretical temperature, = b/iu . 



oL a 



12. Permanent pressure at (the liquid water occupies 



159 c.c.) 



494 atm_ 510 kgm., 



n - 0159 r n - 0159 



subject to the usual proviso as to the lowness of the densities 

 of charge and of the limit of liquefaction of carbonic acid. 



13. Pressure at the theoretical temperature, calculated 

 according to the laws of gases 



/ 6710\ 

 692 (14- - ) 



V 273 / 17220 atm, 17760 kgm. 

 -- = - or - 

 n n n 



or 23,510 kgm. per square centimetre, a value very close to 

 those which belong to nitroglycol (22,910) and nitroglycerin 

 (19,580), as might be expected. 



14. The pressures actually exerted in the explosion of nitro- 

 mannite have been measured by Sarrau and Vieille. These 

 authorities found 



At the density of charge 01, 2273 kgm, 

 At the density of 0'2, 4634 kgm. 



22950 



Or as mean, - , a value very near the theoretical figure. 

 n 



