608 



XXI. 

 para-Nitrophenol : C^Hi {OH),.. (NO,). 



W)' 



m 



Maximum Pressure H 



in mm. mer- 

 cury of 

 O C. 



in Dynes 



Surface- 

 tension X in 

 Erg pro cm2. 



Specific 

 gravity rf^o 



Molecular 

 Surface- 

 energy ," in 

 Erg pro cm2. 



117 



130.5 



145.5 



162 



116.5 



196.5 



1.497 

 1.452 

 1.408 

 1.353 

 1.311 

 1.241 



1996.0 

 1936.9 

 181T.1 

 1815.3 

 1747.8 

 1654.4 



43.3 

 42.0 

 40.6 

 39.1 

 37.7 

 35.6 



1.273 

 1.262 

 1.249 

 1.234 

 1.222 

 1.205 



989.4 

 965.3 

 939. 6 

 912.2 

 885.3 

 843.8 



Molecular weight: 139.05. 



Radius of the Capillary tube : 0.04529 cm. 

 Depth : 0.1 mm. 



The compound melts at 113 C It sublimes rapidly and the measurements 

 are thus made much more difficult by the gradual reduction of the cross- 

 section of the capillary tube by the layers of crystals deposed there within. 

 The specific gravity at 120° C was: 1.2703; at 140"^ C. : l.2532;at 160°C.: 

 1.2361. At t" C: d^o = 1.2874-0.000855(^—100). 



The temperature-coefficient of :' is somewhat oscillating round a mean value 

 of 1.81 Erg pro degree. 



XXII. 



