OSBORNE, m'kELVY AND BEARCE : ETHYL ALCOHOL 



97 



Part III. The density of ethyl alcohol and its mixtures with 

 water. N. S. Osborne. The mean of fifteen determinations of 

 the density at 25° C. of the purest alcohol obtained was found to 

 be 0.78506 gram per milliliter. A series of twenty-five mixtures 

 of known percentages of alcohol and water were prepared as close 

 as possible to integral per cents and their densities at 25° C. 

 determined, partly by the method of hydrostatic weighing and 

 partly by the use of special picnometers; the same constant tem- 

 perature bath being used in both methods. The densities of the 

 various mixtures, reduced to the nearest integral per cent, are 

 shown in Table IT. The values for 90 and 95 per cent are each 

 the mean results of two mixtures. 



TABLE II 



These density values are for mixtures saturated with air. 



Tables I and II permit the calculation of the density of any 

 mixture of ethyl alcohol and water at any temperature between 

 10° and 40° C. (Circular No. 19, Bureau of Standards). 



Part IV. The density and thermal expansion of ethyl alcohol 

 and its mixtures with water. H. W. Bearce. A second and in- 

 dependent series of mixtures of known percentages of alcohol and 

 water were prepared and their densities determined at 15° and 

 25° C, thus furnishing, at the same time, a check on both the 



