490 



C. Barus — Fluid Volume and its 



18. Palmitic acid. — Data for palmitic acid are given in 

 tables 8 and 9 on a plan uniform with the above. Owing to 

 accidents two threads were observed; the first between 65° 

 and 185°, and the second between 65° and 310°. At 65°, 

 solidification set in at about 400 atm. The result is a distortion 

 of the curvature of the isothermal. Difficulties were encoun- 

 tered from breaks of the mercury thread. In this and the 

 following tables, two values of v/ V are usually inserted. 

 They were obtained during the pressure increasing and the 

 pressure decreasing march of the measurements. 



Table 8. 



Compressibility of Palmitic acid, C16H32O2, referred to 20 atm. 

 Melting point 62°; Boiling point 350°. 





V 



Observed. 



/3xl0 6 



Comput'd 



Diff. x 10 3 



#xl0 6 





L,6 





V 



#0 x 10 6 







- X 103 



-xl* 





v xl ° 









65° 



20 



o-o 



o-o 





fo-o 



•0 



91 



93 



16-72 cm 



100 



7-2 



7-2 



90 



7-1 



— •1 









200 



15-0 



153 



85 



15-3 



-•1 









300 



22-8 



23-1 



82 ■ 



230 



-•1 









*400 



31-1 



31-1 



82 



30-1 



+ '2 







100° 



o-o 



o-o 



_-. 



o-o 



•0 



102 



104 



17'16 cm 



100 



81 



8-1 



101 



7-8 



+ '3 









200 



169 



16-3 



93 



16-9 



— •3 









300 



25-5 



25-5 



91 



25-4 



+ •1 









400 



333 



33-3 



88 



33-2 



+ •1 







185° 



20 



o-o 



o-o 



_, _ _ 



00 



•0 



160 



165 



18-50 cm 100 



12-1 



12-1 



151 



12-1 



•0 









200 



26-3 



26-3 



146 



25-5 



-•2 









300 



37-2 



37-8 



134 



37-5 



•0 









400 



48-2 



47-7 



127 



48-5 



-•4 







Second 



sample. 















65° 



20 



o-o 



o-o 















14-63 cm 



100 



200 

 300 

 400 



65 



15-1 

 22-9 

 29 5 



6-9 

 15-1 

 22-3 

 29-5 



84 

 84 

 81 

 78 











310° 



20 



o-o 



o-o 





o-o 



•0 



330 



351 



17.54cm 



100 



23-4 



24-6 



300 



23-7 



+ •3 









200 



47-4 



48-3 



265 



47-5 



+ •4 









300 



66-3 



67 9 



240 



67-2 



-•1 





♦ 





400 



82-6 



84-3 



220 



83-8 



-•1 







Table 9. 



Thermal expansion of Palmitic acid, - 



_x 10 s , referred to 65°. 





Atm.= 





20 



100 



200 



300 



400 



e= 



65° 

























100 



26 



25 



24 



23 



24 





185 



107 



101 



93 



91 



87 





310 



199 



179 



159 



145 



133 



* Solidifying. 



f Including the lower series. 



