68 



TABLE 34.— VOLUME OF A GLASS VESSEL FROM THE WEIGHT OF ITS 

 EQUIVALENT VOLUME OF MERCURY OR WATER 



If a glass vessel contains at t°C, P grams of mercury, weighed with brass weights in air 

 at 760 mmHg pressure, then its volume in cm 3 



P 

 at the same temperature, t : V = PR = P-y> 



at another temperature, h : V = PRi 



P | {l+7(fi-0} 

 a 



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



brass weights, equals 1 gram ; 

 d = the density of mercury or water at t"C, 

 and 7 the cubical expansion coefficient of glass. 



SMITHSONIAN PHYSICAL TABLES 



