174 



Mr. W. Sutherland on the 

 Changes of Volume of Liquid C0 2 . 





From 0° to 18°. 



From -23° to 0°. 



100 atmospheres ... 



200 



300 



•153 

 •103 

 •094 



•100 

 •074 

 •0G2 



The following table contains a comparison of the volumes in 

 litres of a kilogramme of liquid C0 2 in contact with its satu- 

 rated vapour at different temperatures, as determined by 

 Thilorier (Ann. de Chim. et de Phys. 2 ser. lx., 1835), Mitchell 

 (Journ. Franklin Inst, xxvi., 1838), and Cailletet and Mathias 

 (Comptes Rendus, cii. May 1886), and by the equation. 



Volumes, in litres, of a kilogramme of Liquid C0 2 in contact 

 with its Saturated Vapour. 



Temp. 



Thilorier. !*>*" 

 I tion. 



i 



I 



Temp. 



Mitchell. 



Equa- 

 tion. 



1-242 

 1-450 



1 

 Temp. 



Oailletet 



and 

 Mathias. 



Equa- 

 tion. 



1-124 

 1-242 



1-346 

 1-443 



o 



-20 







30 



1-111 1-124 

 1-205 1-242 

 1-670 ; 1-600 



1 



o 





 23 



1-08 

 1-36 



-23 







13 



22 



0965 

 1-087 

 1-220 

 1-380 



While the equation is found to give results in excellent 

 accord with Thilorier's determinations, it is in serious dis- 

 accord with those of Mitchell and of Cailletet and Mathias. 

 Unfortunately Thilorier does not describe how he determined 

 his densities ; so that we cannot imagine the cause of such a 

 large difference as that which exists between his determinations 

 1-205 at 0° and L087, the value found by Cailletet and Mathias, 

 or 1*08 by Mitchell at the same temperature. Mitchell obtained 

 his results by weighing the liquid in minute bulbs. Cailletet 

 and Mathias first determined the density of saturated vapour 

 of C0 2 at different temperatures in capillary tubes ; then they 

 introduced liquid C0 2 in unequal quantities into two vertical 

 tubes containing mercury and communicating with one another 

 by a horizontal tube containing mercury ; the two tubes were 

 brought to the temperature desired, and the difference of level 



