683 



XXVI. 



Molecular weight: 96.03. Radius of the Capillary tube: 0.04839 cm.; in the 

 observations indicated by *, it was: 0.04867cm. 

 Depth : 0.1 mm. 



The liquid boils at 162° and 761 mm. mercury. The substace crystallises in 

 a bath of solid carbondioxide and alcohol, and melts then again at —31° C. ; 

 according to Walden at — 36^ C Above 100° C. the liquid is rapidly oxydized, 

 and gets a brownish colour. At the boilingpoint, the value of z can only differ 

 slightly from: 25.4 Erg pro cm2. The specific gravity at 25° C. was: 1.1563; 

 at 50°C.: 1.1287; at75°C.: i.l023;at^: a'4o=1.1851— 0.001 176 ^+0.00000096 f'. 



The temperature-coefficient /' is almost constant, and has the mean value: 

 2.70 Erg pro degree; it is rather high. 



XXVII. 



Thiophene: C4H4S. 



u 

 3 . 



aj o 



O) 



Maximum Pressure H 



in mm. mer- 

 cury of 

 0° C. 



in Dynes 



Surface- 

 tension ■/ in 

 Erg pro cm2. 



Specific 

 gravity do 



Molecular 

 Surface- 

 energy // in 

 Erg pro cm^. 



-19 

 

 29.9 

 47.3 

 58.7 

 87 



1.134 

 1.057 

 0.939 

 0.874 

 0.834 

 0.732 



1512.3 

 1409.5 

 1252.3 

 1165.5 

 1111.8 

 975.4 



36.0 

 33.5 

 29.5 

 27.4 

 26.1 

 22.8 



1.110 

 1.087 

 1.051 

 1.032 

 1.006 

 0.987 



644.6 

 608.3 

 547.8 

 515.1 

 499.0 

 441.5 



Molecular weight: 84.10. Radius of the Capillary tube: 0.04839 cm.; in the 

 measurements indicated by *, this radius was: 

 0.04867 cm. 

 Depth : 0.1 mm. 



The liquid boils constantly at 87° C. under a pressure of 770 mm. In a 

 bath of solid carbondioxide and alcohol, the substance crystallises, and melts 

 at ^29°.8 C. ; according to Tsakalgtos the meltingpoint is — 37°.l C. At 

 the boilingpoint / has the value: 22.8 Erg pro cm-. 



At 0°C. the specific gravity is: 1.0873; at 25-C.: I.ii573; at 50^ C: 1.0285. 

 At t° C: ^40= 1.0873—0.001224 /+ 0.00000096 A 



The temperature-coefficient of // is fairly constant, with a mean value of: 

 1.90 Erg pro degree. 



4Ï* 



