BRIDGMAN. 



MERCURY UNDER PRESSURE. 



383 



C/p — i/v — — 



\dp)r 



(5 .055 



O .054- 

 ^ .053 



^ D5Z 



O 051 

 Lh .050 

 ^ .049 

 ^ 0A& 

 O .047 

 {J .046 



O 



"^OAS 







1 2 5 4. 5 6 7 



pressure,kgm/cm^io." 



Figure 11. The difference of the specific heats as a function of the pres- 

 sure in gm. cal. for a quantity of mercury occupying 1 cm.* at 0° and atmos- 

 pheric pressure. 



The results in gm. cal. along the isothermal at 0° are given in Figure 

 11. The difference becomes less at high pressures, the rate of decrease 

 itself decreasing rapidly. The behavior is thus different from that of 

 water, which shows an increase. 



The data are not sufficient to give the actual value of either specific 

 heat along the isothermals, but we can find the initial rate of variation 

 from the thermodynamic formula 



\ dp Jr ' WJp 



The work of Callendar and Moss ^* gives at atmospheric pressure and 0° 



" Callendar and Moss, loc. cit. 



