72 Table 40. 



VOLUME OF A CLASS VESSEL FROM THE WEIGHT OF ITS EQUIVALENT 

 VOLUME OF MERCURY OR WATER. 



4' 



If a glass vessel contains at /° C, /* grammes of mercury, weighed with brass weights in air at 

 760 mm. pressure, then its volume in c. cm. 



at the same temperature, /, : V= PR 

 at another temperature, ti, : V = PR\ = P pjd i i + 7 (^1 - ^) | 

 p = the weight, reduced to vacuum, of the mass of mercury or water which, weighed with brass 



weights, equals i gram ; 

 d = the density of mercury or water at /° C, 

 and 7 = 0.000 025, is the cubical expansion coefficient of glass. 



Taken from Landolt, Bornstein, and Meyerhoffer's Physikalisch-Chemische Tabellen, 

 Smithsonian Tables. 



