1876.] Specific Volumes of Liquids . 299 



thirds of the whole, was collected separately. A portion of the distillate 

 was treated with milk of lime and ammonia, and the resulting calcium 

 bromide was tested for iodine in the usual manner, but not a trace was 

 detected. The remainder of the bromine was digested with powdered 

 potassium bromide for several months, again distilled and agitated with 

 phosphoric pentoxide to remove the last traces of moisture. The puri- 

 fied bromine boiled constantly between 59° # 6 and 59°*7. n=0, t'=0. 

 Barometer (corrected and reduced) 765-2 millims. Reduced and cor- 

 rected boiling-point 59°-45. In degrees of air-thermometer 59°-27. 



A determination of the specific gravity of the bromine gave 3-15787 at 

 9°-17, compared with water at the same temperature. Its specific gravity 

 at 0°, compared with water at 4°, is 3-18828. 



Other observers have found for the specific gravity and boiling-point 



of bromine : — 



Boiling-point. Specific gravity. 



millims. 



Pierre 63 at 760-02 3-18718 at 0. 



Andrews 58 „ ? 



Bolas and Groves 59-6 „ 751 



The observations of Balard and Lowig are not given, as they were evi- 

 dently made with bromine containing large quantities of chlorine. 



The observations with the dilatometer have led to the following for- 

 mula as expressing the expansion of bromine between 0° and its boiling- 

 point :— 



V= 1 + 0-001 062 18* + 0-000 001 877 141 1 2 



- 0-000 000 003 085 38 1\ 



By the aid of this formula the following Table has been calculated. 

 It shows the true volume of bromine at every 5° between 0° and 60°, the 

 volume at 0° being taken as 100,000. 



°c. 



Volume. 



Diff. 



°C. 



"Volume. 



Diff. 







100000 





40 



104529 



595 



5 



100536 



536 



45 



105132 



603 



10 



101081 



545 



50 



105742 



610 



15 



101635 



554 



55 



106359 



617 



20 



102197 



562 



60 



106983 



624 



25 



102768 



571 









30 

 35 



103347 

 103934 



579 



587 



59°-27 



1-069111 





The specific gravity of bromine at its boiling-point is 2-98218, and its 

 specific volume = nQ01Q = 53-618. 



* Br = 79-95 (Stas). 



z2 



