80 



VII. 



VIII. 



Dipropylamine : {C3Hy)2NH. 



Maximum Pressure H 



in mm. mer- 

 cury of 

 0° C. 



in Dvnes 



Sui face- 

 tension / in 

 Erg. pro cim^. 



Molecular 

 Specific Surface- 



gravity d.Q ' energy // in 

 j Erg. pro cm2. 



•—19.5 



• 

 29.9 

 48.3 

 65 



80.9 

 104.5 



0.816 



0.746 

 0.652 

 0.596 

 0.546 

 0.505 

 0.453 



1087.9 

 994.6 

 878.0 

 795.4 

 728.5 

 674.0 

 603.9 



25.7 

 23.5 



20.4 

 IS. 4 

 16.8 

 15.6 

 13.8 



0.775 

 0.756 



0.728 

 0.712 

 0.696 

 0.682 

 0.662 



661.0 

 614.6 

 547.1 

 500.8 

 464.2 

 434.2 

 394.3 



Molecular weight: 101.10. Radius of the Capillary tube: 0.04777 cm.; in the 



measurements indicated bv *, the radius was : 



0.04839 cm. 



Depth : 0.1 mm. 



Under a pressure of 762 mm. the iiquid boils at 110.°5 C. Even at —78° C. 



it remained clear, but solidifies afterwards into a mass of white crystals, 



melting at —45° C. At the boilingpoint / = 13.9 Erg. pro cm^. The specific 



weight at 0° C. was: 0.7565; at 25° C : 0.733; at 50° C: 710. At t° C.itis: 



d.o = 0.7565 -0.00095 t -f 0.0000004 <2. The temperature-coefficient of -/ decreases 



gradually with increasing temperature: it is 2.38 between —20° and 48° C; 

 between 48° and 65° C: 2.19; between 65° and 81° C.:1.89; between 81° 

 and 104° C: 1.69 Erg. 



