86 



BRIDGMAN. 



sure could not be released far enough to ensure the completion of the 

 reaction, and hence the AV ^'alues were too low. 



We see that the results are affected by numerous irregularities, due 

 to unavoidable decomposition at the high temperatures, and the slow- 

 ness of the reaction at the low temperatures and pressures. But on 

 the II-III curve the points all lie regularly, as do also the AV points at 

 high pressures. Satisfactory values for AV at low pressures could not 

 be obtained, and the value listed for atmospheric pressure was obtained 

 by extrapolation of the high pressure values. It is to be noticed 

 that the II-III curve shows increasing curvature at the high pressures. 

 This is unusual ; it may possibly be the effect of impurities, although 

 the regularity of the AV points would seem to preclude this. On the 

 I-II curve, the p-t values at high pressures are irregular because of 

 decomposition, and only one good value of AV was found at high 

 pressure. The values both for _p, t and AF at low pressures are, how- 

 ever, apparently satisfactory for I-II. To obtain better values would 

 require a great multiplication of experiments. It might be w^orth 

 trying Avater as the transmitting medium, as possibly the action of 

 mercury is such as to start the decomposition. In any cAent, it would 

 probably not be possible to greatly exceed the temperature reached 

 here without decomposition, and the interesting question as to whether 

 the lines I-II and II-III ultimately approach each other would remain 

 unanswered. 



12 3 4 5 6 

 Pressure, kgm./cm.^ x 10* 



Carbon Trichloride 



Figure 15. Carbon Trichloride. The observed equilibrium temperatures 

 and pressures. 



