424 NITRIC ETHERS PROPERLY SO CALLED. 



tion are identical, according to what has just been said. The 

 reaction will, therefore, be represented by the following 

 formula : 



= 6CO 2 + 5H 3 + 6N + O. 

 The heat developed will be 



The water being liquid, at constant pressure + 356*5 Cal., at 



constant volume + 358*5 Cal. 

 The water being gaseous, at constant pressure + 331*1 Cal,, at 



constant volume + 335'6 Cal. 



For 1 kgm., at constant pressure, the water being liquid, 

 1570 Cal. ; at constant volume, 1579 Cal. 



Sarrau and Vieille found 1600, a figure the difference between 

 which and the above does not exceed that which might be due 

 to experimental errors. 



In the miss-fires, treated of on page 283, the heat liberated is 

 necessarily less, the combustion being incomplete. 



9. Volume of the permanent gases for 1 equiv. 



t 

 106 litres / 1 4- -rzr Y the water being liquid ; 



161*8 litres fl + "^^)* the water being gaseous. 



Or, for 1 kgm., 467 litres ( 1 -f 5=5), the water being liquid. 

 \ 273/ 



Sarrau and Vieille found 465 litres, at 0, by experiment. 



We should have 713 litres (l -f y^>\ the water being gaseous. 

 For a litre of liquid nitroglycerin we should have, lastly 

 747 litres (I -f ^ J the water being liquid ; 



1141 litres (l + A tne water being gaseous. 



10. Theoretical temperature, at constant volume 



335600 



-IT " 6980 ' 



11. Permanent pressure (the liquid water occupies 198 c.c.) 



467 atm. 482 kgm. 

 - or - 

 n - 0-198 n- 0198* 



This figure is only applicable to low densities of charge and 

 with the usual exception as to the liquefaction of carbonic 

 acid. 



