TJie Rate of Explosions in Gases. 



Table III. 

 Velocity of Explosion in Afetres per Second. 



135 



The general agreement between these measurements 

 leaves no room for doubt about the substantial accuracy of 

 the results. The formula given by Berthelot does, therefore, 

 express with a close degree of approximation the rates of 

 explosion of many gaseous mixtures. 



Experiments made on gases at different pressures 

 showed slight variations in the rate of explosion ; accurate 

 measurements were therefore made on the rate of explosion 

 of hydrogen and oxygen under pressures from 200 mm. to 

 1,500 mm. The following table gives the mean rates 

 found : — 



Table IV. 

 Pressure Experi?nents. H2 + o. 



These figures show that the rate of explosion increases 

 rapidly with increase of pressure from 200 mm. ; that the 

 rate of increase diminishes, and that the velocity becomes 

 nearly constant at two atmospheres pressure. Similar 

 results were found in the explosion of other mixtures. 



