of the Liquid and Gaseous States of Matter. 

 Table V. 



689 



Di-isopvopyl. 



Isopentane. 



Propyl 

 formate. 



Methyl 

 propionate. 



Propyl 

 acetate. 



Methyl 

 butyrate. 



T. 



K 4 . 



T. 



K 4 . 



T. 



K 4 . 



T. 



K 4 . 



T. 



K 4 . 



1-72 



1-84 

 1-85 

 1-86 

 1-86 

 1-86 

 1-86 

 1-86 

 1-86 

 1-84 

 1-76 



T. 



273 

 383 

 403 

 423 

 443 

 463 

 483 

 503 

 523 

 543 

 553 



K 4 . 



1-73 



1-78 

 1-80 

 1-81 

 1-81 

 183 

 1-84 

 1-85 

 T86 

 1-83 

 1-72 



273 

 333 

 353 

 373 

 393 

 413 

 433 

 453 

 473 

 489 

 498 



1-68 

 1-74 

 1-74 

 1-70 

 1-73 

 1-73 

 1-72 

 1-73 

 1-73 

 1-70 

 1-64 



273 



293 

 313 

 333 

 353 

 373 

 393 

 413 

 433 

 449 

 458 



1-70 

 1-67 

 1-67 

 1-68 

 1-69 

 1-69 

 1-69 

 1-69 

 1-69 

 1-66 

 1-61 



273 



363 

 383 

 403 

 423 

 443 

 463 

 483 

 503 

 523 

 533 



1-68 

 1-78 

 1-77 

 1-78 

 1-77 

 1-76 

 1-78 

 1-78 

 1-80 

 1-78 

 1-79 



273 

 353 

 373 

 393 

 413 

 433 

 453 

 473 

 493 

 513 

 528 



1-71 



1-80 

 1-80 

 1-80 

 1-80 

 1-81 

 1-81 

 1-82 

 1-82 

 1-79 

 1-69 



273 

 373 

 393 

 413 

 433 

 453 

 473 

 493 

 513 

 533 

 546 



liquids not mentioned in Table II. The values o£ p h p 2 , and 

 L, used in the calculations, are not given in the table: they 

 can be obtained from tables given by Mills, which were quoted 

 previously in this paper. The calculations have been carried 

 out up to a few degrees below the critical temperature. 

 It will be seen by inspection that the mean value of K 4 

 for each liquid depends slightly on the nature of the 

 liquid. 



It should be mentioned here that Jager, Voigt, and 

 Dieterici * have arrived at equations for the internal latent 

 heat which resemble more or less equation (13). These 

 equations were obtained from considerations of the kinetic 

 equilibrium between the molecules shot out of the liquid 

 into the surrounding vapour and the molecules returning 

 from the vapour to the liquid. Dieterici, in the paper men- 

 tioned, by making certain assumptions to simplify the result 

 arrives at the same equation as the above. The application 

 of the equation to a few liquids showed that K 4 is equal to 

 about 1*7. A much more comprehensive test of the equation 

 is given in this paper. 



Cambridge, 



June 2, 1910. 



* Ann. der Phys, xxv. p. 569 (1908). 



Phil. Mag. S. 6. Vol. 20. No. 118. Oct. 1910. 



2Z 



