EFFECTS OF PRESSURE ON NITRATES. 



589 



required to reach approximately stationary conditions, and at each 

 of the high pressure points about 50 minutes. As for most soHds, 

 the velocity was distinctly greater with falling pressure than with 

 rising. It is possible to pass across the equilibrium curve in either 

 direction without the reaction starting, but only to a slight extent 

 The experimental results are shown in Figure 4, the computed 



12 3 4 5 6 

 Pressure, kgm./cm.^ x 10^ 



Caesium Nitrate 



Figure," 4. Caesium Nitrate. The observed equilibrium pressures and 

 temperatures (circles) and the observed changes of volume (crosses). 



E 



12 3 4 5 6 



Pressure, kgm./cm.' x 10" 



Caesium Nitrate 



Figure 5. Caesium Nitrate. The computed heat of transition and the 

 difference of internal energy. 



values of AH and AE in Figure 5, and the numerical values in Table III. 

 The ciu-vatm-e of the y-t curve is normal ; the AV cu^^•e falls with 

 rising pressure, as is normal, but the experimental accuracy was not 

 great enough to surely determine the direction of cur\'atiu-e, so it is 

 drawn as a straight line. 



There seems to be onlv one value for comparison at atmospheric 



