384 EXPLOSIVE GASES AND DETONATING GASEOUS MIXTUKE8. 



by employing the specific heats of the gaseous elements 

 measured at the ordinary temperature. Let us note that here 

 there pan be no question of dissociation, since the products of 

 the explosion are elementary gases. 



Belying on these principles, the heat liberated, the tempera- 

 ture produced, and the pressure developed for ozone and 

 hypochlorous gas, will first be given. As regards chlorous and 

 hypochlorous gas, no measurement has been taken up to now. 

 A summary of the results referring to nitric oxide, cyanogen, 

 and acetylene will be added. 



3. Ozone is changed into ordinary oxygen at the ordinary 

 temperature. This transformation is all the more rapid accord- 

 ing as we operate on a mixture of oxygen and ozone richer in 

 ozone, for the latter has never been isolated in a state of purity. 1 



It is accelerated with the temperature and becomes explosive 

 under the influence of sudden compression. 2 The heat liberated 

 is equal to 14-8 Cal. for 24 grms. of ozone, occupying 11 '16 lit. 

 or 29'6 Cal. for the molecular weight, Oz = 3 (48 grms.), 

 according to the author's experiments, 8 that is, '616 Cal. per 

 kgm. of substance. 



The specific molecular heat of oxygen being equal to 6*95 for 

 32 grms. (or 2 ) at constant pressure, if we suppose this specific 

 heat to be invariable, the temperature attained by pure ozone 

 when being transformed into oxygen would then be 2840 at 

 constant pressure. .At constant volume the specific molecular 

 heat is 5'0 for 2 , and the heat liberated reaches 29 - 9 Cal. 

 Consequently, the specific heat being supposed constant, the 

 temperature produced would be 3987. . 



The pressure developed at constant volume, calculated 

 according to this datum, would be equal to 2 3 '4 atm. 



Such are the characteristic data of ozone, supposing it to be 

 pure and taken under the normal pressure. If this be dwelt 

 upon, it is because this transformation represents a typical case 

 in the theory of explosive bodies, since it is only a question of a 

 simple gas changing as regards condensation. 



In practice, since pure ozone has never yet been obtained, the 

 transformation is effected in a mixture of ozone and ordinary 

 oxygen. Let us give, moreover, the calculation of the pressure 

 developed for a mixture capable of supplying after transforma- 

 tion a weight of oxygen proceeding from the ozone equal to a 

 sixteenth of the total weight (6 '2 hundredths), a mixture which 

 can be easily prepared under ordinary circumstances with the 

 author's apparatus (p. 220). 



1 Upon the rapidity of the transformation, see " Annales de Chimie et de 

 Physique," 5" s^rie, torn. xiv. p. 361, and torn. xxi. p. 162. 



* Chappuis et Hautefeuille, " Comptes rendus des stances de 1'Academie 

 des Sciences," torn. xci. p. 522. 



3 "Annales de Chimie et de Physique," torn. x. p. 152 



