356 



PEOCEEDINGS OF THE AMERICAN ACADEMY. 



Properties of Kerosene under Pressure. 



In the course of the experiment other data were gathered inci- 

 dentally which are of interest for themselves, and which will now be 

 given. First of these is the compressibility and the thermal dilatation 

 of kerosene. It was not necessary to determine this quantity in 



O.OeS 



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O.Osl 



23456789 10 U12 

 Pressure, kgm. / cm.' x 10^ 



Figure 15. The difference between the adiaUMLic and the isothermal 

 compressibilities of water. 



order to find the corrections to be made for the distortion of the vessel, 

 but since half the work was already done in determining the effect 

 with the c^dinder partly filled with kerosene and the other part filled 

 with bessemer steel, it seemed worth while to make the additional 

 run necessary to determine the pressure and temperature effects on 

 the kerosene. Not so many determinations were made of these 

 quantities for kerosene as were made for the water. The results are 

 given in Table VI. The curves showing the total thermal change of 

 volume for 20° intervals are shown in Figure 16. This figure is the 

 analog of Figure 2 for water. The results are very different. At the 

 lower pressures the dilatation is greater at the higher temperatures, 

 as it is for all normal substances, but with rising pressure the effect is 

 reversed, the dilatation becoming greater for the lower temperatures. 

 This is the same behavior which takes place for water at higher 

 temperatures after it has regained normality. But above 5000 kgm. 

 the kerosene shows other abnormalities quite different in their charac- 



