THERMAL PROPERTIES OF CARBONIC ACID AT LOW TEMPERATURES. 



95 



ZKLENY and SMITH (10), and others. The observations are tabulated in parallel 

 columns in Table X. and all plotted in fig. 18 besides the authors' curve. 



The most accurate determinations are probably KUENEN and ROBSON'S below zero 

 and AMAGAT'S above zero. Our curve agrees closely with KUENEN and ROBSON'S, 



900 



- :,, 



700 



600 -too 



500 



400 



306 



200 





10(1 Id 



> 



1C 



LATENT HEAT 



-T CURVE USED BY MOLLIER 



. THE AU1 



PRESSURE- TEMPERATURE 



HORS' P-T CUXVE 



KUENEN AND ROBSON 



ZELENY AND SMITH ---o 



CAILLETCT - X 



-REGNAULT- - --+ 



AMAGAT A 



CAILLETET AND MATH/AS - 



MATH/AS -J 



MOLLIER --e 



CHAPPUIS 



-60 



-50 



-40 



-30 



-20 -10 



Fig. 18. 



\ 



DEGREES CENTIGRADE 



10 



20 



30 



only differing by 3 Ibs. at 510 Ibs. pressure. It also agrees fairly closely with 

 AMAGAT'S, differing by G Ibs. at 830 Ibs. Both these differences are almost exactly 

 equal to the calculated effects of the presence of the observed '11 per cent, of air (by 

 volume) under the special conditions of our test. 



