W / W1 = D / D1
the volumes being equal. And remembering that
W (weight of liquid) = W1 (weight of ball) + x
(where x is always measured as +ve or -ve floating effect), there is obtained the equation:
The results obtained with metallic silver are perhaps the most interesting, mainly from the fact that the metal melts at a higher temperature, which was determined with great care by the illustrious physicist and metallurgist, the late Henri St. Claire Deville, whose latest experiments led him to fix the melting point at 940° Cent. The authors of the paper showed that the density of the fluid metal was 9.51 as compared with 10.57, the density of the solid metal. Taking their results generally, it is found that the change of volume of the following metals in passing from the solid to the liquid state may be thus stated:
Specific Specific
Metal. Gravity, Gravity, Percentage of
Solid. Liquid. Change.
Bismuth 9.82 10.055 Decrease of volume 2.3
Copper 8.8 8.217 Increase " 7.1
Lead 11.4 10.37 " " 9.93
Tin. 7.5 7.025 " " 6.76
Zinc 7.2 6.48 " " 11.10
Silver 10.57 9.51 " " 11.20
Iron 6.95 6.88 " " 1.02