530 



On some Thermodynamical Relations. 



Reduced Values of l-£- . A ; that for Water being made = 



1*000 at each pressure, and the values for other substances 

 at the same pressure reduced in the same ratio. 



Pressure 

 in millim . 



Nitrogen 

 peroxide. 



N 2 4 . 



Ammonium 

 chloride. 

 NH 4 C1. 



Ammonium 

 carbamate. 

 C0 2 N 2 H 6 . 



Chloral methyl- 

 alcoholate. 



cci 3 .ch{^ H3 



Chloral ethyl- 

 alcoholate. 



001 3 OH {oC 2 H 5 



10 







1-451 







50 





1-193 



1-293 



1-170 



1 170 



100 



0-828 



1-226 



1-308 



1-161 



1-178 



150 



0-921 



1193 



1-335 



1-252 



1-209 



200 



1-004 



1-169 



1-306 



1-205 



1-208 



300 



0-987 



1-110 



1-346 



1-197 



1186 



400 



1018 



1116 



1-332 



1-263 



1-193 



500 



1-004 



1143 







1-225 



600 





1-164 









Reduced Values of (-^ ' t); that for Carbon-bisulphide being 

 made =1*000 at each pressure, and the values for other 



substances reduced in 



the same 



ratio. 





Pressure 

 in millim. 



Nitrogen 

 peroxide. 



N 2 4 . 



Ammonium 

 chloride. 

 NH 4 CL 



Ammonium 

 carbamate. 

 C0 2 N 2 H 6 . 



Chloral methyl- 

 alcoholate. 



CC1 3 . CH J 0CH - 3 



Chloral ethyl - 

 alcoholate. 



CCI3.CH J 0C / H5 



10 



50 





1-483 



1-609 



1-456 



1-456 



100 



1043 



1-540 



1-643 



1-458 



1-480 



150 



1-159 



1-502 



1-681 



1-576 



1-522 



200 



1-277 



1-486 



1-659 



1-532 



1-535 



300 



1-255 



1-412 



1-711 



1-521 



1-508 



400 



1-298 



1-423 



1-699 



1-611 



1-522 



500 



1-281 



1-458 







1-562 



600 





1-488 









A relation may be observed between the two substances 

 bromobenzene and chlorobenzene, and also between ethyl 

 chloride, ethyl bromide, and ethyl iodide. The ratio of the 

 absolute temperatures of the bodies in either group corre- 

 sponding to any given vapour-pressure is a constant. Thus 

 the ratio of the absolute temperature of bromobenzene to that 

 of chlorobenzene when the vapour-pressure of both is 100 



364*3 

 millim. = ».., , or 1*061; and at the other pressures up to 



700 millim. the ratio remains absolutely constant at 1*059. 

 The ratio of the absolute temperatures of ethyl bromide and 

 ethyl chloride has been determined for pressures between 150 



