()34 



XXVIII 



Piperidine: CsHio> NH. 



E~ 



Maximum Pressure H 



in mm. mer- 

 cury of 

 0° C. 



in Dynes 



Surface- 

 tension X in 

 Erg pro cm-. 



Specific 

 gravity d.r, 



I Molecular 

 Surface- 

 energy /' in 

 I Erg pro cm2. 



—19 

 



29.4 

 48 

 64.5 

 80.9 

 104.5 



1.041 

 0.973 

 0.876 

 0.813 

 0.753 

 0.703 

 0.628 



1388.6 

 1297.7 

 1168.0 

 1084.3 

 1004.8 

 937.8 

 837.4 



32.8 

 30.6 



27.1 

 25.1 

 23.2 

 21.6 

 19.2 



0900 

 0.882 

 0.855 

 0.838 

 0.823 

 0.808 

 0.786 



680.8 

 643.7 

 582.0 

 546.3 

 511.1 

 481.7 

 436.2 



Molecular weight : 85.10 



Radius of the Capillary tube: 0.04777 cm. ; in the 

 observations indicated by *, it was: 0.04839 cm. 

 Depth: 0.1 mm. 

 Under a pressure of 760 mm. the base boils at 108° C. On cooling it crys- 

 tallises, and melts afterwards at —9^ C; according to Mascarelli thistem- 

 oerature would be —13° C; at the boiling point /. is about : 19.7 Erg pro cm^. 

 The specific gravity at 0^ C. is: 0.8820; at 25° C. : i'.8586; at 50=C. : 0.8359. 

 At t° C. : d^o =0.8821 — 0.00092 t. The tempemture-coefficient of y is fairly 

 constant : its mean value can be fixed upon 1.98 Erg pro degree. 



Molecular Surface- 

 Energy u in Erg pro c.m^. 



20' O' 20° 40' 60* 80" 100 120° 



Fig. 3. 



Temperaluie 



