513 



VicENTiNi and Omodki found Z) := 0,8298 (liquid) at 62°,i. From 

 this follows therefore: 



335,2' 



0,8298 = i>„ 



or = 1). 



1—0 565 



1770 



= 0,893 i>. 



1 



335,2 



0,556 - 



1560 



^ 0,881 D, 



from which D^ = 0,929 to 0,942. 

 From this follows for bk: 



2,599X39,1 _ 101,6 



"~2Ö825 



97,79 



h 



or hk = 



0,929X22412 

 2,501X39,1 



0,942x22412 

 And further for aic : 



1770X48,8. 10-4 



21120 



= 488.10-» 



= 463 . 10— "^ 



<tA; = 



or ak = 

 yielding l/at 



74,29 

 1560X46,3. 10-4 



86380 



= 10-4= 1163 



74,29 



10 4 



72230 



74,90 74,90 



34,1 a 31,1 . 10-2. 



10-4—964,4. 10-4 



For pk we find : 



pk = 



or Pk 



1770 



2185X488. 10-5 

 1560 



1770 

 1560 



= 166 atm. 



154 



2185X463.10-5 10,12 

 in consequence of which log^" pk = 2,220 to 2,188. 



From the formula for the calculation of the coefficient of expansion 

 (c from y, derived above for sodium, we then find : 



0,565 _ 0,565 



""1565" 



a 



or (t ^= 



1770—0,565x363 

 0,556 



= 361 



10-H 



409 . 10-« 



1560-0,556X363 



And as « = 299.10~*^ has been experimentally found by Hagen 

 between 70° and 110° C. (mean temperature 90° C = 363° abs.), 

 it follows from this that the value, calculated from y with 7'=: 1770°, 

 is nearer the truth than that value calculated with 1560°. (Just as 

 for sodium the expansibility at 90° C. will probably be lower than 

 the normal value at higher temperatures, so that 299 will be too 

 small. Indeed all Hagen's values seem to be too small. For Na 278 

 had to be raised to 325 through the later determinations of Vanstone). 



