488 Dielectric Constants of Esters at Low Temperatures. 



the n-butyl acetate was just beginning to solidfy and when it 

 was solid just below the melting-point. The melting-point 

 was afterwards determined, the result obtained* being 



-77°-9C. 



Table II. 

 n-Butyl acetate. 



Temperature. Dielectric Constant. 



292° A 5-05 



280°-5A 5-10 



273°-5 A 5-25 



264°-5 A 5-59 



258° -7 A 5-625 



200° -5 A 6-85 



195°T A just melting. 6*965 



195°-1 A just solid. 2-395 



77°-6A 2-41 



Fiff. 2. 



100 200 - 31 



Adso/i/te Tempers tares. 



The results are plotted graphically in fig. 2. It will be 

 seen that the dielectric constant arises from 5*95 at 292° A 

 to 6'965 at 195°'l A, the melting-point, in a manner such 

 that the relation of the dielectric constant to the temperature 

 is almost exactly a linear one. Then there is si sudden fall 

 in the value during solidification to 2'395, and finally a very 



