SPECIFIC  GRAVITY  OF  MIXTURES  OF  ALCOHOL  AND  WATER.  349 
THE   SPECIFIC  GRAVITY  OF  MIXTURES  OF  ALCOHOL  AND 
WATER. 
After  three  series  of  determinations  which  have  occupied  him 
more  than  a  year,  H.  von  Baumhauer  has  arrived  at  the  con- 
viction that  the  specific  gravities  of  mixtures  of  alcohol  and  wa- 
ter as  determined  by  Gilpin,  Ldwitz  and  Gay-Lussac,  are  very 
incorrect.  In  the  first  series  of  experiments  the  mixtures  were 
made  by  volume,  but  as  these  gave  results  so  different  from  those 
generally  received,  the  author  repeated  his  experiments  with 
mixtures  made  by  weight  as  well  as  by  measure.  These,  how- 
ever, only  confirmed  the  results  previously  obtained.  The  au- 
thor started  with  absolute  alcohol  having  a  sp.  gr.  of  0.7946  at 
59°  F.  In  the  second  series  alcohol  from  another  source  was 
used  which  had  the  sp.  gr.  0*7947  at  the  same  temperature.  The 
water  used  in  the  experiments  was  distilled  and  carefully  de- 
prived of  air.  After  corrections  for  slight  mistakes  the  results 
obtained  were  as  follows  : — 
Alcohol  in  100  of 
the  mixture.  1st  series.  2d  series. 
100        ...    0-7939  .  .  .  0-7940 
95  0-8119  .  .  0-8121 
90  0-8283  .  .  .  0-8283 
85        .       .       .    0-8438  .  .  .  0-8432 
80  0-8576  .  •  .  0^8572 
75  0-8708  .  .  .  0-8708 
70  0-8837  .  .  ,  0-8938 
65  0-8959  .  .  .  0-8963 
60  0-9079  .  .  .  0-9081 
55  0-9193  .  .  .  0-9196 
50  0-9301  .  .  .  0-9302 
45        ...    0-9394  .  .  .  0-9400 
40  0-9485  .  .  .  0-9491 
35  0-9567  .  .  .  0-9569 
30  0-9635  .  .  .  0.9636 
25  0-9692  .  .  .  0-9696 
20  0-9746  .  .  .  0-9747 
15  0-9799  .  .  .  0-9800 
10  0-9855  .  .  .  0-9855 
5  0-9919  .  .  .  0-9918 
0  0-9991  .  .  .  0-9991 
Ohem.  News,  London,  April  7,  1860,  from  Comptes-Rendm. 
